diff --git a/packages/react-native/Libraries/Core/InitializeCore.js b/packages/react-native/Libraries/Core/InitializeCore.js
index 25377f6890cb90..8224a1c53f7ba6 100644
--- a/packages/react-native/Libraries/Core/InitializeCore.js
+++ b/packages/react-native/Libraries/Core/InitializeCore.js
@@ -27,7 +27,7 @@
 const start = Date.now();
 
 require('./setUpGlobals');
-require('./setUpDOM');
+require('../../src/private/core/setUpDOM');
 require('./setUpPerformance');
 require('./setUpErrorHandling');
 require('./polyfillPromise');
diff --git a/packages/react-native/Libraries/Debugging/DebuggingOverlayRegistry.js b/packages/react-native/Libraries/Debugging/DebuggingOverlayRegistry.js
index bfd89b1dc8e4ba..11560ebc3943ab 100644
--- a/packages/react-native/Libraries/Debugging/DebuggingOverlayRegistry.js
+++ b/packages/react-native/Libraries/Debugging/DebuggingOverlayRegistry.js
@@ -9,8 +9,8 @@
  * @oncall react_native
  */
 
-import type ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
-import type ReadOnlyElement from '../DOM/Nodes/ReadOnlyElement';
+import type ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
+import type ReadOnlyElement from '../../src/private/dom/nodes/ReadOnlyElement';
 import type {
   AppContainerRootViewRef,
   DebuggingOverlayRef,
@@ -230,7 +230,7 @@ class DebuggingOverlayRegistry {
 
       // Lazy import to avoid dependency cycle.
       const ReactNativeElementClass =
-        require('../DOM/Nodes/ReactNativeElement').default;
+        require('../../src/private/dom/nodes/ReactNativeElement').default;
       if (publicInstance instanceof ReactNativeElementClass) {
         modernNodesUpdates.push({
           id: instanceReactTag,
@@ -371,7 +371,7 @@ class DebuggingOverlayRegistry {
 
     // Lazy import to avoid dependency cycle.
     const ReactNativeElementClass =
-      require('../DOM/Nodes/ReactNativeElement').default;
+      require('../../src/private/dom/nodes/ReactNativeElement').default;
 
     const reactNativeElements: Array<ReactNativeElement> = [];
     const legacyPublicInstances: Array<NativeMethods> = [];
diff --git a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserver.js b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserver.js
index 23d2c158569c0b..15b83f68b6f222 100644
--- a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserver.js
+++ b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserver.js
@@ -13,7 +13,7 @@
 import type IntersectionObserverEntry from './IntersectionObserverEntry';
 import type {IntersectionObserverId} from './IntersectionObserverManager';
 
-import ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
+import ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
 import * as IntersectionObserverManager from './IntersectionObserverManager';
 
 export type IntersectionObserverCallback = (
diff --git a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverEntry.js b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverEntry.js
index 23833face664a9..e6648190ec8b00 100644
--- a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverEntry.js
+++ b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverEntry.js
@@ -10,10 +10,10 @@
 
 // flowlint unsafe-getters-setters:off
 
-import type ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
+import type ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
 import type {NativeIntersectionObserverEntry} from './NativeIntersectionObserver';
 
-import DOMRectReadOnly from '../DOM/Geometry/DOMRectReadOnly';
+import DOMRectReadOnly from '../../src/private/dom/geometry/DOMRectReadOnly';
 
 /**
  * The [`IntersectionObserverEntry`](https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserverEntry)
diff --git a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverManager.js b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverManager.js
index 892fce941c1020..c2e9e0fff7aacc 100644
--- a/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverManager.js
+++ b/packages/react-native/Libraries/IntersectionObserver/IntersectionObserverManager.js
@@ -18,13 +18,16 @@
  * the notifications together.
  */
 
-import type ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
+import type ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
 import type IntersectionObserver, {
   IntersectionObserverCallback,
 } from './IntersectionObserver';
 import type IntersectionObserverEntry from './IntersectionObserverEntry';
 
-import {getInstanceHandle, getShadowNode} from '../DOM/Nodes/ReadOnlyNode';
+import {
+  getInstanceHandle,
+  getShadowNode,
+} from '../../src/private/dom/nodes/ReadOnlyNode';
 import * as Systrace from '../Performance/Systrace';
 import warnOnce from '../Utilities/warnOnce';
 import {createIntersectionObserverEntry} from './IntersectionObserverEntry';
diff --git a/packages/react-native/Libraries/IntersectionObserver/__mocks__/NativeIntersectionObserver.js b/packages/react-native/Libraries/IntersectionObserver/__mocks__/NativeIntersectionObserver.js
index cb3d7fd9d87a0b..5d98ff8458980b 100644
--- a/packages/react-native/Libraries/IntersectionObserver/__mocks__/NativeIntersectionObserver.js
+++ b/packages/react-native/Libraries/IntersectionObserver/__mocks__/NativeIntersectionObserver.js
@@ -8,7 +8,7 @@
  * @format
  */
 
-import type ReactNativeElement from '../../DOM/Nodes/ReactNativeElement';
+import type ReactNativeElement from '../../../src/private/dom/nodes/ReactNativeElement';
 import type IntersectionObserver from '../IntersectionObserver';
 import type {
   NativeIntersectionObserverEntry,
@@ -16,7 +16,7 @@ import type {
   Spec,
 } from '../NativeIntersectionObserver';
 
-import {getShadowNode} from '../../DOM/Nodes/ReadOnlyNode';
+import {getShadowNode} from '../../../src/private/dom/nodes/ReadOnlyNode';
 import {getFabricUIManager} from '../../ReactNative/__mocks__/FabricUIManager';
 import invariant from 'invariant';
 import nullthrows from 'nullthrows';
diff --git a/packages/react-native/Libraries/MutationObserver/MutationObserver.js b/packages/react-native/Libraries/MutationObserver/MutationObserver.js
index 4c6c4ef2294aee..1d92c77de4d90d 100644
--- a/packages/react-native/Libraries/MutationObserver/MutationObserver.js
+++ b/packages/react-native/Libraries/MutationObserver/MutationObserver.js
@@ -13,7 +13,7 @@
 import type {MutationObserverId} from './MutationObserverManager';
 import type MutationRecord from './MutationRecord';
 
-import ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
+import ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
 import * as MutationObserverManager from './MutationObserverManager';
 
 export type MutationObserverCallback = (
diff --git a/packages/react-native/Libraries/MutationObserver/MutationObserverManager.js b/packages/react-native/Libraries/MutationObserver/MutationObserverManager.js
index 9cdf56f0c5dbad..d04af028063cd4 100644
--- a/packages/react-native/Libraries/MutationObserver/MutationObserverManager.js
+++ b/packages/react-native/Libraries/MutationObserver/MutationObserverManager.js
@@ -18,7 +18,7 @@
  * the notifications together.
  */
 
-import type ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
+import type ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
 import type MutationObserver, {
   MutationObserverCallback,
 } from './MutationObserver';
@@ -27,7 +27,7 @@ import type MutationRecord from './MutationRecord';
 import {
   getPublicInstanceFromInternalInstanceHandle,
   getShadowNode,
-} from '../DOM/Nodes/ReadOnlyNode';
+} from '../../src/private/dom/nodes/ReadOnlyNode';
 import * as Systrace from '../Performance/Systrace';
 import warnOnce from '../Utilities/warnOnce';
 import {createMutationRecord} from './MutationRecord';
diff --git a/packages/react-native/Libraries/MutationObserver/MutationRecord.js b/packages/react-native/Libraries/MutationObserver/MutationRecord.js
index 18cce2d1fda14d..321698b1b1843c 100644
--- a/packages/react-native/Libraries/MutationObserver/MutationRecord.js
+++ b/packages/react-native/Libraries/MutationObserver/MutationRecord.js
@@ -10,11 +10,13 @@
 
 // flowlint unsafe-getters-setters:off
 
-import type ReactNativeElement from '../DOM/Nodes/ReactNativeElement';
-import type ReadOnlyNode from '../DOM/Nodes/ReadOnlyNode';
+import type ReactNativeElement from '../../src/private/dom/nodes/ReactNativeElement';
+import type ReadOnlyNode from '../../src/private/dom/nodes/ReadOnlyNode';
 import type {NativeMutationRecord} from './NativeMutationObserver';
 
-import NodeList, {createNodeList} from '../DOM/OldStyleCollections/NodeList';
+import NodeList, {
+  createNodeList,
+} from '../../src/private/dom/oldstylecollections/NodeList';
 
 export type MutationType = 'attributes' | 'characterData' | 'childList';
 
diff --git a/packages/react-native/Libraries/MutationObserver/__mocks__/NativeMutationObserver.js b/packages/react-native/Libraries/MutationObserver/__mocks__/NativeMutationObserver.js
index d7ffb65520d827..b3f048492fc7c4 100644
--- a/packages/react-native/Libraries/MutationObserver/__mocks__/NativeMutationObserver.js
+++ b/packages/react-native/Libraries/MutationObserver/__mocks__/NativeMutationObserver.js
@@ -28,7 +28,7 @@ import type {
   Spec,
 } from '../NativeMutationObserver';
 
-import ReadOnlyNode from '../../DOM/Nodes/ReadOnlyNode';
+import ReadOnlyNode from '../../../src/private/dom/nodes/ReadOnlyNode';
 import {
   type NodeMock,
   type UIManagerCommitHook,
diff --git a/packages/react-native/Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance.js b/packages/react-native/Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance.js
index 54d8368ff2b8c6..7ef1fe05092d7a 100644
--- a/packages/react-native/Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance.js
+++ b/packages/react-native/Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance.js
@@ -13,8 +13,8 @@
  * instances and get some data from them (like their instance handle / fiber).
  */
 
-import type ReactNativeElement from '../../DOM/Nodes/ReactNativeElement';
-import type ReadOnlyText from '../../DOM/Nodes/ReadOnlyText';
+import type ReactNativeElement from '../../../src/private/dom/nodes/ReactNativeElement';
+import type ReadOnlyText from '../../../src/private/dom/nodes/ReadOnlyText';
 import typeof ReactFabricType from '../../Renderer/shims/ReactFabric';
 import type {
   InternalInstanceHandle,
@@ -44,7 +44,7 @@ export function createPublicInstance(
     // the right module to avoid eagerly loading both.
     if (ReactNativeFeatureFlags.enableAccessToHostTreeInFabric()) {
       PublicInstanceClass =
-        require('../../DOM/Nodes/ReactNativeElement').default;
+        require('../../../src/private/dom/nodes/ReactNativeElement').default;
     } else {
       PublicInstanceClass = require('./ReactFabricHostComponent').default;
     }
@@ -57,7 +57,8 @@ export function createPublicTextInstance(
   internalInstanceHandle: InternalInstanceHandle,
 ): ReadOnlyText {
   if (ReadOnlyTextClass == null) {
-    ReadOnlyTextClass = require('../../DOM/Nodes/ReadOnlyText').default;
+    ReadOnlyTextClass =
+      require('../../../src/private/dom/nodes/ReadOnlyText').default;
   }
 
   return new ReadOnlyTextClass(internalInstanceHandle);
diff --git a/packages/react-native/Libraries/ReactNative/__mocks__/FabricUIManager.js b/packages/react-native/Libraries/ReactNative/__mocks__/FabricUIManager.js
index 83727b345374b2..3aa395231a3a57 100644
--- a/packages/react-native/Libraries/ReactNative/__mocks__/FabricUIManager.js
+++ b/packages/react-native/Libraries/ReactNative/__mocks__/FabricUIManager.js
@@ -394,7 +394,8 @@ const FabricUIManagerMock: IFabricUIManagerMock = {
 
   compareDocumentPosition: jest.fn((node: Node, otherNode: Node): number => {
     /* eslint-disable no-bitwise */
-    const ReadOnlyNode = require('../../DOM/Nodes/ReadOnlyNode').default;
+    const ReadOnlyNode =
+      require('../../../src/private/dom/nodes/ReadOnlyNode').default;
 
     // Quick check for node vs. itself
     if (fromNode(node).reactTag === fromNode(otherNode).reactTag) {
diff --git a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
index 1298282e9a116c..1025a942ecf374 100644
--- a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
+++ b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
@@ -4433,8 +4433,6 @@ exports[`public API should not change unintentionally Libraries/Core/setUpAlert.
 
 exports[`public API should not change unintentionally Libraries/Core/setUpBatchedBridge.js 1`] = `""`;
 
-exports[`public API should not change unintentionally Libraries/Core/setUpDOM.js 1`] = `""`;
-
 exports[`public API should not change unintentionally Libraries/Core/setUpDeveloperTools.js 1`] = `""`;
 
 exports[`public API should not change unintentionally Libraries/Core/setUpErrorHandling.js 1`] = `""`;
@@ -4475,280 +4473,6 @@ exports[`public API should not change unintentionally Libraries/Core/setUpTimers
 
 exports[`public API should not change unintentionally Libraries/Core/setUpXHR.js 1`] = `""`;
 
-exports[`public API should not change unintentionally Libraries/DOM/Geometry/DOMRect.js 1`] = `
-"declare export default class DOMRect extends DOMRectReadOnly {
-  get x(): number;
-  set x(x: ?number): void;
-  get y(): number;
-  set y(y: ?number): void;
-  get width(): number;
-  set width(width: ?number): void;
-  get height(): number;
-  set height(height: ?number): void;
-  static fromRect(rect?: ?DOMRectLike): DOMRect;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Geometry/DOMRectReadOnly.js 1`] = `
-"export interface DOMRectLike {
-  x?: ?number;
-  y?: ?number;
-  width?: ?number;
-  height?: ?number;
-}
-declare export default class DOMRectReadOnly {
-  _x: number;
-  _y: number;
-  _width: number;
-  _height: number;
-  constructor(x: ?number, y: ?number, width: ?number, height: ?number): void;
-  get x(): number;
-  get y(): number;
-  get width(): number;
-  get height(): number;
-  get top(): number;
-  get right(): number;
-  get bottom(): number;
-  get left(): number;
-  toJSON(): {
-    x: number,
-    y: number,
-    width: number,
-    height: number,
-    top: number,
-    left: number,
-    bottom: number,
-    right: number,
-  };
-  static fromRect(rect?: ?DOMRectLike): DOMRectReadOnly;
-  __getInternalX(): number;
-  __getInternalY(): number;
-  __getInternalWidth(): number;
-  __getInternalHeight(): number;
-  __setInternalX(x: ?number): void;
-  __setInternalY(y: ?number): void;
-  __setInternalWidth(width: ?number): void;
-  __setInternalHeight(height: ?number): void;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/ReactNativeElement.js 1`] = `
-"declare export default class ReactNativeElement
-  extends ReadOnlyElement
-  implements INativeMethods
-{
-  __nativeTag: number;
-  __internalInstanceHandle: InternalInstanceHandle;
-  _viewConfig: ViewConfig;
-  constructor(
-    tag: number,
-    viewConfig: ViewConfig,
-    internalInstanceHandle: InternalInstanceHandle
-  ): void;
-  get offsetHeight(): number;
-  get offsetLeft(): number;
-  get offsetParent(): ReadOnlyElement | null;
-  get offsetTop(): number;
-  get offsetWidth(): number;
-  blur(): void;
-  focus(): void;
-  measure(callback: MeasureOnSuccessCallback): void;
-  measureInWindow(callback: MeasureInWindowOnSuccessCallback): void;
-  measureLayout(
-    relativeToNativeNode: number | ElementRef<HostComponent<mixed>>,
-    onSuccess: MeasureLayoutOnSuccessCallback,
-    onFail?: () => void
-  ): void;
-  setNativeProps(nativeProps: { ... }): void;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/ReadOnlyCharacterData.js 1`] = `
-"declare export default class ReadOnlyCharacterData extends ReadOnlyNode {
-  get nextElementSibling(): ReadOnlyElement | null;
-  get previousElementSibling(): ReadOnlyElement | null;
-  get data(): string;
-  get length(): number;
-  get textContent(): string | null;
-  get nodeValue(): string;
-  substringData(offset: number, count: number): string;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/ReadOnlyElement.js 1`] = `
-"declare export default class ReadOnlyElement extends ReadOnlyNode {
-  get childElementCount(): number;
-  get children(): HTMLCollection<ReadOnlyElement>;
-  get clientHeight(): number;
-  get clientLeft(): number;
-  get clientTop(): number;
-  get clientWidth(): number;
-  get firstElementChild(): ReadOnlyElement | null;
-  get id(): string;
-  get lastElementChild(): ReadOnlyElement | null;
-  get nextElementSibling(): ReadOnlyElement | null;
-  get nodeName(): string;
-  get nodeType(): number;
-  get nodeValue(): string | null;
-  set nodeValue(value: string): void;
-  get previousElementSibling(): ReadOnlyElement | null;
-  get scrollHeight(): number;
-  get scrollLeft(): number;
-  get scrollTop(): number;
-  get scrollWidth(): number;
-  get tagName(): string;
-  get textContent(): string | null;
-  getBoundingClientRect(): DOMRect;
-  hasPointerCapture(pointerId: number): boolean;
-  setPointerCapture(pointerId: number): void;
-  releasePointerCapture(pointerId: number): void;
-}
-declare export function getBoundingClientRect(
-  node: ReadOnlyElement,
-  { includeTransform: boolean }
-): DOMRect;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/ReadOnlyNode.js 1`] = `
-"declare export default class ReadOnlyNode {
-  constructor(internalInstanceHandle: InternalInstanceHandle): void;
-  get childNodes(): NodeList<ReadOnlyNode>;
-  get firstChild(): ReadOnlyNode | null;
-  get isConnected(): boolean;
-  get lastChild(): ReadOnlyNode | null;
-  get nextSibling(): ReadOnlyNode | null;
-  get nodeName(): string;
-  get nodeType(): number;
-  get nodeValue(): string | null;
-  get parentElement(): ReadOnlyElement | null;
-  get parentNode(): ReadOnlyNode | null;
-  get previousSibling(): ReadOnlyNode | null;
-  get textContent(): string | null;
-  compareDocumentPosition(otherNode: ReadOnlyNode): number;
-  contains(otherNode: ReadOnlyNode): boolean;
-  getRootNode(): ReadOnlyNode;
-  hasChildNodes(): boolean;
-  static ELEMENT_NODE: number;
-  static ATTRIBUTE_NODE: number;
-  static TEXT_NODE: number;
-  static CDATA_SECTION_NODE: number;
-  static ENTITY_REFERENCE_NODE: number;
-  static ENTITY_NODE: number;
-  static PROCESSING_INSTRUCTION_NODE: number;
-  static COMMENT_NODE: number;
-  static DOCUMENT_NODE: number;
-  static DOCUMENT_TYPE_NODE: number;
-  static DOCUMENT_FRAGMENT_NODE: number;
-  static NOTATION_NODE: number;
-  static DOCUMENT_POSITION_DISCONNECTED: number;
-  static DOCUMENT_POSITION_PRECEDING: number;
-  static DOCUMENT_POSITION_FOLLOWING: number;
-  static DOCUMENT_POSITION_CONTAINS: number;
-  static DOCUMENT_POSITION_CONTAINED_BY: number;
-  static DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-}
-declare export function getInstanceHandle(
-  node: ReadOnlyNode
-): InternalInstanceHandle;
-declare export function getShadowNode(node: ReadOnlyNode): ?ShadowNode;
-declare export function getChildNodes(
-  node: ReadOnlyNode
-): $ReadOnlyArray<ReadOnlyNode>;
-declare export function getPublicInstanceFromInternalInstanceHandle(
-  instanceHandle: InternalInstanceHandle
-): ?ReadOnlyNode;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/ReadOnlyText.js 1`] = `
-"declare export default class ReadOnlyText extends ReadOnlyCharacterData {
-  get nodeName(): string;
-  get nodeType(): number;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/Nodes/Utilities/Traversal.js 1`] = `
-"declare export function getElementSibling(
-  node: ReadOnlyNode,
-  direction: \\"next\\" | \\"previous\\"
-): ReadOnlyElement | null;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/OldStyleCollections/ArrayLikeUtils.js 1`] = `
-"export interface ArrayLike<T> extends Iterable<T> {
-  [indexer: number]: T;
-  +length: number;
-}
-declare export function createValueIterator<T>(
-  arrayLike: ArrayLike<T>
-): Iterator<T>;
-declare export function createKeyIterator<T>(
-  arrayLike: ArrayLike<T>
-): Iterator<number>;
-declare export function createEntriesIterator<T>(
-  arrayLike: ArrayLike<T>
-): Iterator<[number, T]>;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/OldStyleCollections/DOMRectList.js.flow 1`] = `
-"declare export default class DOMRectList
-  implements Iterable<DOMRectReadOnly>, ArrayLike<DOMRectReadOnly>
-{
-  [index: number]: DOMRectReadOnly;
-  +length: number;
-  item(index: number): DOMRectReadOnly | null;
-  @@iterator(): Iterator<DOMRectReadOnly>;
-}
-declare export function createDOMRectList(
-  domRects: $ReadOnlyArray<DOMRectReadOnly>
-): DOMRectList;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/OldStyleCollections/HTMLCollection.js.flow 1`] = `
-"declare export default class HTMLCollection<+T>
-  implements Iterable<T>, ArrayLike<T>
-{
-  [index: number]: T;
-  +length: number;
-  item(index: number): T | null;
-  namedItem(name: string): T | null;
-  @@iterator(): Iterator<T>;
-}
-declare export function createHTMLCollection<T>(
-  elements: $ReadOnlyArray<T>
-): HTMLCollection<T>;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/DOM/OldStyleCollections/NodeList.js.flow 1`] = `
-"declare export default class NodeList<+T> implements Iterable<T>, ArrayLike<T> {
-  [index: number]: T;
-  +length: number;
-  item(index: number): T | null;
-  entries(): Iterator<[number, T]>;
-  forEach<ThisType>(
-    callbackFn: (value: T, index: number, array: NodeList<T>) => mixed,
-    thisArg?: ThisType
-  ): void;
-  keys(): Iterator<number>;
-  values(): Iterator<T>;
-  @@iterator(): Iterator<T>;
-}
-declare export function createNodeList<T>(
-  elements: $ReadOnlyArray<T>
-): NodeList<T>;
-"
-`;
-
 exports[`public API should not change unintentionally Libraries/Debugging/DebuggingOverlay.js 1`] = `
 "type DebuggingOverlayHandle = {
   highlightTraceUpdates(updates: TraceUpdate[]): void,
diff --git a/packages/react-native/Libraries/__tests__/public-api-test.js b/packages/react-native/Libraries/__tests__/public-api-test.js
index 3e54a4d09c94ca..7e1316e2daab5f 100644
--- a/packages/react-native/Libraries/__tests__/public-api-test.js
+++ b/packages/react-native/Libraries/__tests__/public-api-test.js
@@ -44,9 +44,6 @@ const FILES_WITH_KNOWN_ERRORS = new Set([
   'Libraries/Components/UnimplementedViews/UnimplementedView.js',
   'Libraries/Core/ReactNativeVersion.js',
   'Libraries/Core/ReactNativeVersionCheck.js',
-  'Libraries/DOM/OldStyleCollections/DOMRectList.js',
-  'Libraries/DOM/OldStyleCollections/HTMLCollection.js',
-  'Libraries/DOM/OldStyleCollections/NodeList.js',
   'Libraries/Image/ImageBackground.js',
   'Libraries/Inspector/ElementProperties.js',
   'Libraries/Inspector/BorderBox.js',
diff --git a/packages/react-native/Libraries/Core/setUpDOM.js b/packages/react-native/src/private/core/setUpDOM.js
similarity index 81%
rename from packages/react-native/Libraries/Core/setUpDOM.js
rename to packages/react-native/src/private/core/setUpDOM.js
index e25aa01371329c..a5fd5e31082a26 100644
--- a/packages/react-native/Libraries/Core/setUpDOM.js
+++ b/packages/react-native/src/private/core/setUpDOM.js
@@ -8,8 +8,8 @@
  * @format
  */
 
-import DOMRect from '../DOM/Geometry/DOMRect';
-import DOMRectReadOnly from '../DOM/Geometry/DOMRectReadOnly';
+import DOMRect from '../dom/geometry/DOMRect';
+import DOMRectReadOnly from '../dom/geometry/DOMRectReadOnly';
 
 // $FlowExpectedError[cannot-write] The global isn't writable anywhere but here, where we define it
 global.DOMRect = DOMRect;
diff --git a/packages/react-native/Libraries/DOM/Geometry/DOMRect.js b/packages/react-native/src/private/dom/geometry/DOMRect.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/Geometry/DOMRect.js
rename to packages/react-native/src/private/dom/geometry/DOMRect.js
diff --git a/packages/react-native/Libraries/DOM/Geometry/DOMRectReadOnly.js b/packages/react-native/src/private/dom/geometry/DOMRectReadOnly.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/Geometry/DOMRectReadOnly.js
rename to packages/react-native/src/private/dom/geometry/DOMRectReadOnly.js
diff --git a/packages/react-native/Libraries/DOM/Nodes/ReactNativeElement.js b/packages/react-native/src/private/dom/nodes/ReactNativeElement.js
similarity index 91%
rename from packages/react-native/Libraries/DOM/Nodes/ReactNativeElement.js
rename to packages/react-native/src/private/dom/nodes/ReactNativeElement.js
index 366a4532a7c939..d19790e5f0a7ae 100644
--- a/packages/react-native/Libraries/DOM/Nodes/ReactNativeElement.js
+++ b/packages/react-native/src/private/dom/nodes/ReactNativeElement.js
@@ -18,13 +18,13 @@ import type {
   MeasureLayoutOnSuccessCallback,
   MeasureOnSuccessCallback,
   ViewConfig,
-} from '../../Renderer/shims/ReactNativeTypes';
+} from '../../../../Libraries//Renderer/shims/ReactNativeTypes';
 import type {ElementRef} from 'react';
 
-import TextInputState from '../../Components/TextInput/TextInputState';
-import {getFabricUIManager} from '../../ReactNative/FabricUIManager';
-import {create as createAttributePayload} from '../../ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
-import warnForStyleProps from '../../ReactNative/ReactFabricPublicInstance/warnForStyleProps';
+import TextInputState from '../../../../Libraries//Components/TextInput/TextInputState';
+import {getFabricUIManager} from '../../../../Libraries//ReactNative/FabricUIManager';
+import {create as createAttributePayload} from '../../../../Libraries//ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
+import warnForStyleProps from '../../../../Libraries//ReactNative/ReactFabricPublicInstance/warnForStyleProps';
 import ReadOnlyElement, {getBoundingClientRect} from './ReadOnlyElement';
 import ReadOnlyNode from './ReadOnlyNode';
 import {
diff --git a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyCharacterData.js b/packages/react-native/src/private/dom/nodes/ReadOnlyCharacterData.js
similarity index 92%
rename from packages/react-native/Libraries/DOM/Nodes/ReadOnlyCharacterData.js
rename to packages/react-native/src/private/dom/nodes/ReadOnlyCharacterData.js
index 6c9f87b43200b1..7f5047a6dfe76a 100644
--- a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyCharacterData.js
+++ b/packages/react-native/src/private/dom/nodes/ReadOnlyCharacterData.js
@@ -12,9 +12,9 @@
 
 import type ReadOnlyElement from './ReadOnlyElement';
 
-import {getFabricUIManager} from '../../ReactNative/FabricUIManager';
+import {getFabricUIManager} from '../../../../Libraries//ReactNative/FabricUIManager';
 import ReadOnlyNode, {getShadowNode} from './ReadOnlyNode';
-import {getElementSibling} from './Utilities/Traversal';
+import {getElementSibling} from './utilities/Traversal';
 import nullthrows from 'nullthrows';
 
 export default class ReadOnlyCharacterData extends ReadOnlyNode {
diff --git a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyElement.js b/packages/react-native/src/private/dom/nodes/ReadOnlyElement.js
similarity index 95%
rename from packages/react-native/Libraries/DOM/Nodes/ReadOnlyElement.js
rename to packages/react-native/src/private/dom/nodes/ReadOnlyElement.js
index 03cf37949b3b2c..9e9c6a2550bcb1 100644
--- a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyElement.js
+++ b/packages/react-native/src/private/dom/nodes/ReadOnlyElement.js
@@ -10,17 +10,17 @@
 
 // flowlint unsafe-getters-setters:off
 
-import type HTMLCollection from '../OldStyleCollections/HTMLCollection';
+import type HTMLCollection from '../oldstylecollections/HTMLCollection';
 
-import {getFabricUIManager} from '../../ReactNative/FabricUIManager';
-import DOMRect from '../Geometry/DOMRect';
-import {createHTMLCollection} from '../OldStyleCollections/HTMLCollection';
+import {getFabricUIManager} from '../../../../Libraries//ReactNative/FabricUIManager';
+import DOMRect from '../geometry/DOMRect';
+import {createHTMLCollection} from '../oldstylecollections/HTMLCollection';
 import ReadOnlyNode, {
   getChildNodes,
   getInstanceHandle,
   getShadowNode,
 } from './ReadOnlyNode';
-import {getElementSibling} from './Utilities/Traversal';
+import {getElementSibling} from './utilities/Traversal';
 import nullthrows from 'nullthrows';
 
 export default class ReadOnlyElement extends ReadOnlyNode {
diff --git a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyNode.js b/packages/react-native/src/private/dom/nodes/ReadOnlyNode.js
similarity index 95%
rename from packages/react-native/Libraries/DOM/Nodes/ReadOnlyNode.js
rename to packages/react-native/src/private/dom/nodes/ReadOnlyNode.js
index 01720a2ecae4ab..f0df8373c4f27d 100644
--- a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyNode.js
+++ b/packages/react-native/src/private/dom/nodes/ReadOnlyNode.js
@@ -13,12 +13,12 @@
 import type {
   InternalInstanceHandle,
   Node as ShadowNode,
-} from '../../Renderer/shims/ReactNativeTypes';
-import type NodeList from '../OldStyleCollections/NodeList';
+} from '../../../../Libraries/Renderer/shims/ReactNativeTypes';
+import type NodeList from '../oldstylecollections/NodeList';
 import type ReadOnlyElement from './ReadOnlyElement';
 
-import {getFabricUIManager} from '../../ReactNative/FabricUIManager';
-import {createNodeList} from '../OldStyleCollections/NodeList';
+import {getFabricUIManager} from '../../../../Libraries//ReactNative/FabricUIManager';
+import {createNodeList} from '../oldstylecollections/NodeList';
 import nullthrows from 'nullthrows';
 
 // We initialize this lazily to avoid a require cycle
@@ -310,7 +310,7 @@ function setInstanceHandle(
 export function getShadowNode(node: ReadOnlyNode): ?ShadowNode {
   // Lazy import Fabric here to avoid DOM Node APIs classes from having side-effects.
   // With a static import we can't use these classes for Paper-only variants.
-  const ReactFabric = require('../../Renderer/shims/ReactFabric');
+  const ReactFabric = require('../../../../Libraries/Renderer/shims/ReactFabric');
   return ReactFabric.getNodeFromInternalInstanceHandle(getInstanceHandle(node));
 }
 
@@ -357,7 +357,7 @@ export function getPublicInstanceFromInternalInstanceHandle(
 ): ?ReadOnlyNode {
   // Lazy import Fabric here to avoid DOM Node APIs classes from having side-effects.
   // With a static import we can't use these classes for Paper-only variants.
-  const ReactFabric = require('../../Renderer/shims/ReactFabric');
+  const ReactFabric = require('../../../../Libraries/Renderer/shims/ReactFabric');
   const mixedPublicInstance =
     ReactFabric.getPublicInstanceFromInternalInstanceHandle(instanceHandle);
   // $FlowExpectedError[incompatible-return] React defines public instances as "mixed" because it can't access the definition from React Native.
diff --git a/packages/react-native/Libraries/DOM/Nodes/ReadOnlyText.js b/packages/react-native/src/private/dom/nodes/ReadOnlyText.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/Nodes/ReadOnlyText.js
rename to packages/react-native/src/private/dom/nodes/ReadOnlyText.js
diff --git a/packages/react-native/Libraries/DOM/Nodes/Utilities/Traversal.js b/packages/react-native/src/private/dom/nodes/utilities/Traversal.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/Nodes/Utilities/Traversal.js
rename to packages/react-native/src/private/dom/nodes/utilities/Traversal.js
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/ArrayLikeUtils.js b/packages/react-native/src/private/dom/oldstylecollections/ArrayLikeUtils.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/ArrayLikeUtils.js
rename to packages/react-native/src/private/dom/oldstylecollections/ArrayLikeUtils.js
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js b/packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js
similarity index 97%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js
rename to packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js
index 9365a9a5a29f7b..5705bcf4c0e09c 100644
--- a/packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js
+++ b/packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js
@@ -10,7 +10,7 @@
 
 // flowlint unsafe-getters-setters:off
 
-import type DOMRectReadOnly from '../Geometry/DOMRectReadOnly';
+import type DOMRectReadOnly from '../geometry/DOMRectReadOnly';
 import type {ArrayLike} from './ArrayLikeUtils';
 
 import {createValueIterator} from './ArrayLikeUtils';
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js.flow b/packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js.flow
similarity index 92%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js.flow
rename to packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js.flow
index 8edfd68e96888f..251c84c25f77c4 100644
--- a/packages/react-native/Libraries/DOM/OldStyleCollections/DOMRectList.js.flow
+++ b/packages/react-native/src/private/dom/oldstylecollections/DOMRectList.js.flow
@@ -8,7 +8,7 @@
  * @flow strict
  */
 
-import type DOMRectReadOnly from '../Geometry/DOMRectReadOnly';
+import type DOMRectReadOnly from '../geometry/DOMRectReadOnly';
 import type {ArrayLike} from './ArrayLikeUtils';
 
 declare export default class DOMRectList
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/HTMLCollection.js b/packages/react-native/src/private/dom/oldstylecollections/HTMLCollection.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/HTMLCollection.js
rename to packages/react-native/src/private/dom/oldstylecollections/HTMLCollection.js
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/HTMLCollection.js.flow b/packages/react-native/src/private/dom/oldstylecollections/HTMLCollection.js.flow
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/HTMLCollection.js.flow
rename to packages/react-native/src/private/dom/oldstylecollections/HTMLCollection.js.flow
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/NodeList.js b/packages/react-native/src/private/dom/oldstylecollections/NodeList.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/NodeList.js
rename to packages/react-native/src/private/dom/oldstylecollections/NodeList.js
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/NodeList.js.flow b/packages/react-native/src/private/dom/oldstylecollections/NodeList.js.flow
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/NodeList.js.flow
rename to packages/react-native/src/private/dom/oldstylecollections/NodeList.js.flow
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/DOMRectList-test.js b/packages/react-native/src/private/dom/oldstylecollections/__tests__/DOMRectList-test.js
similarity index 97%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/DOMRectList-test.js
rename to packages/react-native/src/private/dom/oldstylecollections/__tests__/DOMRectList-test.js
index c91abc26947367..9d6bb51e2a96e7 100644
--- a/packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/DOMRectList-test.js
+++ b/packages/react-native/src/private/dom/oldstylecollections/__tests__/DOMRectList-test.js
@@ -9,7 +9,7 @@
  * @oncall react_native
  */
 
-import DOMRectReadOnly from '../../Geometry/DOMRectReadOnly';
+import DOMRectReadOnly from '../../geometry/DOMRectReadOnly';
 import {createDOMRectList} from '../DOMRectList';
 
 const domRectA = new DOMRectReadOnly();
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/HTMLCollection-test.js b/packages/react-native/src/private/dom/oldstylecollections/__tests__/HTMLCollection-test.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/HTMLCollection-test.js
rename to packages/react-native/src/private/dom/oldstylecollections/__tests__/HTMLCollection-test.js
diff --git a/packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/NodeList-test.js b/packages/react-native/src/private/dom/oldstylecollections/__tests__/NodeList-test.js
similarity index 100%
rename from packages/react-native/Libraries/DOM/OldStyleCollections/__tests__/NodeList-test.js
rename to packages/react-native/src/private/dom/oldstylecollections/__tests__/NodeList-test.js
diff --git a/packages/rn-tester/js/examples/MutationObserver/MutationObserverExample.js b/packages/rn-tester/js/examples/MutationObserver/MutationObserverExample.js
index 804a021fca859e..609617899228e7 100644
--- a/packages/rn-tester/js/examples/MutationObserver/MutationObserverExample.js
+++ b/packages/rn-tester/js/examples/MutationObserver/MutationObserverExample.js
@@ -8,15 +8,15 @@
  * @flow strict-local
  */
 
-import type ReadOnlyNode from 'react-native/Libraries/DOM/Nodes/ReadOnlyNode';
-import type NodeList from 'react-native/Libraries/DOM/OldStyleCollections/NodeList';
+import type ReadOnlyNode from 'react-native/src/private/dom/nodes/ReadOnlyNode';
+import type NodeList from 'react-native/src/private/dom/oldstylecollections/NodeList';
 
 import {RNTesterThemeContext} from '../../components/RNTesterTheme';
 import * as React from 'react';
 import {type ElementRef, useContext, useEffect, useRef, useState} from 'react';
 import {Pressable, ScrollView, StyleSheet, Text, View} from 'react-native';
-import ReadOnlyElement from 'react-native/Libraries/DOM/Nodes/ReadOnlyElement';
 import MutationObserver from 'react-native/Libraries/MutationObserver/MutationObserver';
+import ReadOnlyElement from 'react-native/src/private/dom/nodes/ReadOnlyElement';
 
 export const name = 'MutationObserver Example';
 export const title = name;
diff --git a/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VCTrackerExample.js b/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VCTrackerExample.js
index 414eed58b2ac6b..665c0f74fbafef 100644
--- a/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VCTrackerExample.js
+++ b/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VCTrackerExample.js
@@ -8,12 +8,12 @@
  * @format
  */
 
-import type DOMRectReadOnly from 'react-native/Libraries/DOM/Geometry/DOMRectReadOnly';
-import type ReadOnlyNode from 'react-native/Libraries/DOM/Nodes/ReadOnlyNode';
+import type DOMRectReadOnly from 'react-native/src/private/dom/geometry/DOMRectReadOnly';
+import type ReadOnlyNode from 'react-native/src/private/dom/nodes/ReadOnlyNode';
 
-import ReactNativeElement from 'react-native/Libraries/DOM/Nodes/ReactNativeElement';
 import IntersectionObserver from 'react-native/Libraries/IntersectionObserver/IntersectionObserver';
 import MutationObserver from 'react-native/Libraries/MutationObserver/MutationObserver';
+import ReactNativeElement from 'react-native/src/private/dom/nodes/ReactNativeElement';
 
 export type VisualElement = {
   time: number,
diff --git a/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VisualCompletionExample.js b/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VisualCompletionExample.js
index f187082948f326..4190dc93ecc6aa 100644
--- a/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VisualCompletionExample.js
+++ b/packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VisualCompletionExample.js
@@ -21,7 +21,7 @@ import {
   Text,
   View,
 } from 'react-native';
-import ReactNativeElement from 'react-native/Libraries/DOM/Nodes/ReactNativeElement';
+import ReactNativeElement from 'react-native/src/private/dom/nodes/ReactNativeElement';
 
 export const name = 'Visual Completion Example';
 export const title = name;