diff --git a/common/changes/@rushstack/eslint-patch/main_2024-05-16-16-05.json b/common/changes/@rushstack/eslint-patch/main_2024-05-16-16-05.json
new file mode 100644
index 00000000000..5a6c97d177c
--- /dev/null
+++ b/common/changes/@rushstack/eslint-patch/main_2024-05-16-16-05.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/eslint-patch",
+      "comment": "[eslint-patch] Allow use of ESLint v9",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/eslint-patch"
+}
\ No newline at end of file
diff --git a/eslint/eslint-patch/src/_patch-base.ts b/eslint/eslint-patch/src/_patch-base.ts
index 7a9b007d50a..9088f4c9572 100644
--- a/eslint/eslint-patch/src/_patch-base.ts
+++ b/eslint/eslint-patch/src/_patch-base.ts
@@ -34,7 +34,7 @@ let namingPath: string | undefined = undefined;
 let eslintFolder: string | undefined = undefined;
 
 // Probe for the ESLint >=8.0.0 layout:
-for (let currentModule: NodeModule = module; ; ) {
+for (let currentModule: NodeModule = module; ;) {
   if (!eslintrcBundlePath) {
     if (currentModule.filename.endsWith('eslintrc.cjs')) {
       // For ESLint >=8.0.0, all @eslint/eslintrc code is bundled at this path:
@@ -93,7 +93,7 @@ for (let currentModule: NodeModule = module; ; ) {
 
 if (!eslintFolder) {
   // Probe for the ESLint >=7.12.0 layout:
-  for (let currentModule: NodeModule = module; ; ) {
+  for (let currentModule: NodeModule = module; ;) {
     if (!configArrayFactoryPath) {
       // For ESLint >=7.12.0, config-array-factory.js is at this path:
       //   .../@eslint/eslintrc/lib/config-array-factory.js
@@ -154,7 +154,7 @@ if (!eslintFolder) {
 
 if (!eslintFolder) {
   // Probe for the <7.12.0 layout:
-  for (let currentModule: NodeModule = module; ; ) {
+  for (let currentModule: NodeModule = module; ;) {
     // For ESLint <7.12.0, config-array-factory.js was at this path:
     //   .../eslint/lib/cli-engine/config-array-factory.js
     if (/[\\/]eslint[\\/]lib[\\/]cli-engine[\\/]config-array-factory\.js$/i.test(currentModule.filename)) {
@@ -185,8 +185,8 @@ if (!eslintFolder) {
       // This was tested with ESLint 6.1.0 .. 7.12.1.
       throw new Error(
         'Failed to patch ESLint because the calling module was not recognized.\n' +
-          'If you are using a newer ESLint version that may be unsupported, please create a GitHub issue:\n' +
-          'https://github.com/microsoft/rushstack/issues'
+        'If you are using a newer ESLint version that may be unsupported, please create a GitHub issue:\n' +
+        'https://github.com/microsoft/rushstack/issues'
       );
     }
     currentModule = currentModule.parent;
@@ -204,18 +204,18 @@ if (isNaN(ESLINT_MAJOR_VERSION)) {
   );
 }
 
-if (!(ESLINT_MAJOR_VERSION >= 6 && ESLINT_MAJOR_VERSION <= 8)) {
+if (!(ESLINT_MAJOR_VERSION >= 6 && ESLINT_MAJOR_VERSION <= 9)) {
   throw new Error(
-    'The ESLint patch script has only been tested with ESLint version 6.x, 7.x, and 8.x.' +
-      ` (Your version: ${eslintPackageVersion})\n` +
-      'Consider reporting a GitHub issue:\n' +
-      'https://github.com/microsoft/rushstack/issues'
+    'The ESLint patch script has only been tested with ESLint version 6.x, 7.x, 8.x, and 9.x.' +
+    ` (Your version: ${eslintPackageVersion})\n` +
+    'Consider reporting a GitHub issue:\n' +
+    'https://github.com/microsoft/rushstack/issues'
   );
 }
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 let configArrayFactory: any;
-if (ESLINT_MAJOR_VERSION === 8) {
+if (ESLINT_MAJOR_VERSION >= 8) {
   configArrayFactory = require(eslintrcBundlePath!).Legacy.ConfigArrayFactory;
 } else {
   configArrayFactory = require(configArrayFactoryPath!).ConfigArrayFactory;
@@ -225,7 +225,7 @@ if (ESLINT_MAJOR_VERSION === 8) {
 let ModuleResolver: { resolve: any };
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 let Naming: { normalizePackageName: any };
-if (ESLINT_MAJOR_VERSION === 8) {
+if (ESLINT_MAJOR_VERSION >= 8) {
   ModuleResolver = require(eslintrcBundlePath!).Legacy.ModuleResolver;
   Naming = require(eslintrcBundlePath!).Legacy.naming;
 } else {