diff --git a/internal/bundler/bundler.go b/internal/bundler/bundler.go
index e50166ce949..008c6091d49 100644
--- a/internal/bundler/bundler.go
+++ b/internal/bundler/bundler.go
@@ -661,18 +661,23 @@ func ResolveFailureErrorTextSuggestionNotes(
 		if strings.HasPrefix(pkg, "node:") {
 			pkg = pkg[5:]
 		}
+
+		var how string
+		switch logger.API {
+		case logger.CLIAPI:
+			how = "--platform=node"
+		case logger.JSAPI:
+			how = "platform: 'node'"
+		case logger.GoAPI:
+			how = "Platform: api.PlatformNode"
+		}
+
 		if resolver.BuiltInNodeModules[pkg] {
-			var how string
-			switch logger.API {
-			case logger.CLIAPI:
-				how = "--platform=node"
-			case logger.JSAPI:
-				how = "platform: 'node'"
-			case logger.GoAPI:
-				how = "Platform: api.PlatformNode"
-			}
 			hint = fmt.Sprintf("The package %q wasn't found on the file system but is built into node. "+
 				"Are you trying to bundle for node? You can use %q to do that, which will remove this error.", path, how)
+		} else if strings.HasPrefix(pkg, "bun:") {
+			hint = fmt.Sprintf("The package %q wasn't found on the file system but is built into Bun. "+
+				"Bun users should target Node.js with %q which will remove this error.", path, how)
 		}
 	}
 
diff --git a/internal/bundler_tests/bundler_default_test.go b/internal/bundler_tests/bundler_default_test.go
index a36a5d3a0c0..c62cc7381fb 100644
--- a/internal/bundler_tests/bundler_default_test.go
+++ b/internal/bundler_tests/bundler_default_test.go
@@ -2543,6 +2543,31 @@ func TestAutoExternalNode(t *testing.T) {
 	})
 }
 
+func TestAutoExternalBun(t *testing.T) {
+	default_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/entry.js": `
+				// These URLs should be external automatically
+				import {file} from "bun";
+				import { Database } from "bun:sqlite";
+
+				await file("./test.txt");
+				const db = new Database(":memory:");
+
+				// This should be external and should be tree-shaken because it's side-effect free
+				import "bun:ffi";
+				import "bun";
+			`,
+		},
+		entryPaths: []string{"/entry.js"},
+		options: config.Options{
+			Mode:         config.ModeBundle,
+			AbsOutputDir: "/out",
+			Platform:     config.PlatformNode,
+		},
+	})
+}
+
 func TestExternalWithWildcard(t *testing.T) {
 	default_suite.expectBundled(t, bundled{
 		files: map[string]string{
diff --git a/internal/bundler_tests/snapshots/snapshots_default.txt b/internal/bundler_tests/snapshots/snapshots_default.txt
index d76d075f800..70bae8f7d0d 100644
--- a/internal/bundler_tests/snapshots/snapshots_default.txt
+++ b/internal/bundler_tests/snapshots/snapshots_default.txt
@@ -150,6 +150,15 @@ import "https://example.com/code.js";
 import "//example.com/code.js";
 import "data:application/javascript;base64,ZXhwb3J0IGRlZmF1bHQgMTIz";
 
+================================================================================
+TestAutoExternalBun
+---------- /out/entry.js ----------
+// entry.js
+import { file } from "bun";
+import { Database } from "bun:sqlite";
+await file("./test.txt");
+var db = new Database(":memory:");
+
 ================================================================================
 TestAutoExternalNode
 ---------- /out/entry.js ----------
diff --git a/internal/resolver/resolver.go b/internal/resolver/resolver.go
index 77703b0d0ad..3e8e7cca208 100644
--- a/internal/resolver/resolver.go
+++ b/internal/resolver/resolver.go
@@ -441,7 +441,18 @@ func (res *Resolver) Resolve(sourceDir string, importPath string, kind ast.Impor
 		if r.debugLogs != nil {
 			r.debugLogs.addNote("Marking this path as implicitly external due to it being a node built-in")
 		}
+		r.flushDebugLogs(flushDueToSuccess)
+		return &ResolveResult{
+			PathPair:               PathPair{Primary: logger.Path{Text: importPath}},
+			IsExternal:             true,
+			PrimarySideEffectsData: &SideEffectsData{}, // Mark this with "sideEffects: false"
+		}, debugMeta
+	}
 
+	if r.options.Platform == config.PlatformNode && (strings.HasPrefix(importPath, "bun:") || importPath == "bun") {
+		if r.debugLogs != nil {
+			r.debugLogs.addNote("Marking this path as implicitly external due to it being a Bun built-in")
+		}
 		r.flushDebugLogs(flushDueToSuccess)
 		return &ResolveResult{
 			PathPair:               PathPair{Primary: logger.Path{Text: importPath}},
@@ -495,6 +506,22 @@ func (res *Resolver) Resolve(sourceDir string, importPath string, kind ast.Impor
 			IsExternal:             true,
 			PrimarySideEffectsData: sideEffects,
 		}, debugMeta
+
+	}
+
+	if r.options.Platform == config.PlatformNode && (strings.HasPrefix(importPath, "bun:") || importPath == "bun") {
+		if r.debugLogs != nil {
+			r.debugLogs.addNote("Marking this path as implicitly external due to it being a Bun built-in")
+		}
+
+		// NodeColonPrefixImport check isn't necessary because the "bun:" prefix is always required
+
+		r.flushDebugLogs(flushDueToSuccess)
+		return &ResolveResult{
+			PathPair:               PathPair{Primary: logger.Path{Text: importPath}},
+			IsExternal:             true,
+			PrimarySideEffectsData: &SideEffectsData{},
+		}, debugMeta
 	}
 
 	if parsed, ok := ParseDataURL(importPath); ok {