diff --git a/.changes/next-release/bugfix-S3EventNotifications-86f3901.json b/.changes/next-release/bugfix-S3EventNotifications-86f3901.json
new file mode 100644
index 000000000000..80496fc6ba63
--- /dev/null
+++ b/.changes/next-release/bugfix-S3EventNotifications-86f3901.json
@@ -0,0 +1,6 @@
+{
+    "type": "bugfix",
+    "category": "S3 Event Notifications",
+    "contributor": "",
+    "description": "Fixed a bug where null values are not handled properly when `S3EventNotification#fromJson` is invoked, throwing `IllegalArgumentException`. See [#5730](https://github.com/aws/aws-sdk-java-v2/issues/5730)"
+}
diff --git a/services-custom/s3-event-notifications/src/main/java/software/amazon/awssdk/eventnotifications/s3/internal/DefaultS3EventNotificationReader.java b/services-custom/s3-event-notifications/src/main/java/software/amazon/awssdk/eventnotifications/s3/internal/DefaultS3EventNotificationReader.java
index 948a010eaa9e..cdb1f1975e71 100644
--- a/services-custom/s3-event-notifications/src/main/java/software/amazon/awssdk/eventnotifications/s3/internal/DefaultS3EventNotificationReader.java
+++ b/services-custom/s3-event-notifications/src/main/java/software/amazon/awssdk/eventnotifications/s3/internal/DefaultS3EventNotificationReader.java
@@ -70,7 +70,7 @@ private S3EventNotification readEvent(JsonNode jsonNode) {
     }
 
     private List<S3EventNotificationRecord> readRecords(JsonNode node) {
-        if (node == null || node.isNull()) {
+        if (isNull(node)) {
             return null;
         }
         List<JsonNode> recordArray = expectArrayOrNull(node, "Records");
@@ -274,15 +274,19 @@ private String expectStringOrNull(Map<String, JsonNode> node, String name) {
     }
 
     private String expectStringOrNull(JsonNode node, String name) {
-        if (node == null) {
+        if (isNull(node)) {
             return null;
         }
         Validate.isTrue(node.isString(), "'%s' was not a string", name);
         return node.asString();
     }
 
+    private static boolean isNull(JsonNode node) {
+        return node == null || node.isNull();
+    }
+
     private List<JsonNode> expectArrayOrNull(JsonNode node, String name) {
-        if (node == null) {
+        if (isNull(node)) {
             return null;
         }
         Validate.isTrue(node.isArray(), "expected '%s' to be an array, but was not.", name);
@@ -290,7 +294,7 @@ private List<JsonNode> expectArrayOrNull(JsonNode node, String name) {
     }
 
     private Map<String, JsonNode> expectObjectOrNull(JsonNode node, String name) {
-        if (node == null) {
+        if (isNull(node)) {
             return null;
         }
         return expectObject(node, name);
@@ -302,7 +306,7 @@ private Map<String, JsonNode> expectObject(JsonNode node, String name) {
     }
 
     private Long expectLong(JsonNode node, String name) {
-        if (node == null) {
+        if (isNull(node)) {
             return null;
         }
         Validate.isTrue(node.isNumber(), "expected '%s' to be numeric, but was not", name);
diff --git a/services-custom/s3-event-notifications/src/test/java/software/amazon/awssdk/eventnotifications/s3/model/S3EventNotificationReaderTest.java b/services-custom/s3-event-notifications/src/test/java/software/amazon/awssdk/eventnotifications/s3/model/S3EventNotificationReaderTest.java
index ab5814a8182b..ff369943bc1f 100644
--- a/services-custom/s3-event-notifications/src/test/java/software/amazon/awssdk/eventnotifications/s3/model/S3EventNotificationReaderTest.java
+++ b/services-custom/s3-event-notifications/src/test/java/software/amazon/awssdk/eventnotifications/s3/model/S3EventNotificationReaderTest.java
@@ -40,6 +40,75 @@
 
 class S3EventNotificationReaderTest {
 
+    @Test
+    void fromJson_containsNullValues_shouldSucceed() {
+        S3EventNotification eventNotification = new S3EventNotification(
+            Collections.singletonList(new S3EventNotificationRecord(
+                "us-west-2",
+                "ObjectCreated:Put",
+                "aws:s3",
+                "1970-01-01T00:00:00.000Z",
+                "2.1",
+                null,
+                new ResponseElements(
+                    null, null),
+                new S3(
+                    "testConfigRule",
+                    new S3Bucket(
+                        "mybucket",
+                        new UserIdentity("A3NL1KOZZKExample"),
+                        "arn:aws:s3:::mybucket"),
+                    new S3Object(
+                        "HappyFace.jpg",
+                        null,
+                        "d41d8cd98f00b204e9800998ecf8427e",
+                        null,
+                        "0055AED6DCD90281E5"),
+                    "1.0"
+                ),
+                new UserIdentity("AIDAJDPLRKLG7UEXAMPLE"),
+                null, null, null, null)
+            ));
+        String json = eventNotification.toJsonPretty();
+        assertThat(json).isEqualTo("{\n"
+                                   + "  \"Records\" : [ {\n"
+                                   + "    \"eventVersion\" : \"2.1\",\n"
+                                   + "    \"eventSource\" : \"aws:s3\",\n"
+                                   + "    \"awsRegion\" : \"us-west-2\",\n"
+                                   + "    \"eventTime\" : \"1970-01-01T00:00:00Z\",\n"
+                                   + "    \"eventName\" : \"ObjectCreated:Put\",\n"
+                                   + "    \"userIdentity\" : {\n"
+                                   + "      \"principalId\" : \"AIDAJDPLRKLG7UEXAMPLE\"\n"
+                                   + "    },\n"
+                                   + "    \"requestParameters\" : null,\n"
+                                   + "    \"responseElements\" : {\n"
+                                   + "      \"x-amz-request-id\" : null,\n"
+                                   + "      \"x-amz-id-2\" : null\n"
+                                   + "    },\n"
+                                   + "    \"s3\" : {\n"
+                                   + "      \"s3SchemaVersion\" : \"1.0\",\n"
+                                   + "      \"configurationId\" : \"testConfigRule\",\n"
+                                   + "      \"bucket\" : {\n"
+                                   + "        \"name\" : \"mybucket\",\n"
+                                   + "        \"ownerIdentity\" : {\n"
+                                   + "          \"principalId\" : \"A3NL1KOZZKExample\"\n"
+                                   + "        },\n"
+                                   + "        \"arn\" : \"arn:aws:s3:::mybucket\"\n"
+                                   + "      },\n"
+                                   + "      \"object\" : {\n"
+                                   + "        \"key\" : \"HappyFace.jpg\",\n"
+                                   + "        \"size\" : null,\n"
+                                   + "        \"eTag\" : \"d41d8cd98f00b204e9800998ecf8427e\",\n"
+                                   + "        \"versionId\" : null,\n"
+                                   + "        \"sequencer\" : \"0055AED6DCD90281E5\"\n"
+                                   + "      }\n"
+                                   + "    }\n"
+                                   + "  } ]\n"
+                                   + "}");
+        S3EventNotification actual = S3EventNotification.fromJson(json);
+        assertThat(actual).isEqualTo(eventNotification);
+    }
+
     @Test
     void givenEventWithoutOptionalFields_whenReadingJson_expectOnlyRequiredFields() {
         String eventJson = "{  "