diff --git a/common/tools/eslint-plugin-azure-sdk/README.md b/common/tools/eslint-plugin-azure-sdk/README.md
index 997d564d3d6c..bcec2d711e68 100644
--- a/common/tools/eslint-plugin-azure-sdk/README.md
+++ b/common/tools/eslint-plugin-azure-sdk/README.md
@@ -113,7 +113,6 @@ Some rules (see table below) are fixable using the `--fix` ESLint option (added
 | [**ts-naming-subclients**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-naming-subclients.md)                                             | :triangular_flag_on_post: | :x:                | `1.2.0` |
 | [**ts-no-const-enums**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-const-enums.md)                                                   | :warning:                 | :heavy_check_mark: | `1.1.0` |
 | [**ts-no-window**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-window.md)                                                             | :triangular_flag_on_post: | :heavy_check_mark: | `3.1.0` |
-| [**ts-no-namespaces**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-namespaces.md)                                                     | :triangular_flag_on_post: | :x:                | `1.2.0` |
 | [**ts-package-json-author**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-package-json-author.md)                                         | :triangular_flag_on_post: | :heavy_check_mark: | `1.0.0` |
 | [**ts-package-json-bugs**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-package-json-bugs.md)                                             | :triangular_flag_on_post: | :heavy_check_mark: | `1.0.0` |
 | [**ts-package-json-engine-is-present**](https://github.com/Azure/azure-sdk-for-js/blob/main/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-package-json-engine-is-present.md)                   | :triangular_flag_on_post: | :heavy_check_mark: | `1.1.0` |
diff --git a/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-namespaces.md b/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-namespaces.md
deleted file mode 100644
index 682da4debfdb..000000000000
--- a/common/tools/eslint-plugin-azure-sdk/docs/rules/ts-no-namespaces.md
+++ /dev/null
@@ -1,21 +0,0 @@
-# ts-no-namespaces
-
-Forbids the usage of TypeScript namespaces.
-
-## Examples
-
-### Bad
-
-```ts
-namespace Example {}
-```
-
-```ts
-module Example {}
-```
-
-## When to turn off
-
-Only if the rule breaks.
-
-## [Source](https://azure.github.io/azure-sdk/typescript_design.html#ts-no-namespaces)
diff --git a/common/tools/eslint-plugin-azure-sdk/src/configs/azure-sdk-base.ts b/common/tools/eslint-plugin-azure-sdk/src/configs/azure-sdk-base.ts
index 04e0253a360b..a742e20d0eeb 100644
--- a/common/tools/eslint-plugin-azure-sdk/src/configs/azure-sdk-base.ts
+++ b/common/tools/eslint-plugin-azure-sdk/src/configs/azure-sdk-base.ts
@@ -88,7 +88,7 @@ export default {
     "@typescript-eslint/no-inferrable-types": "off",
     // We use empty extends and empty interface for shimming and renaming extensively
     "@typescript-eslint/no-empty-interface": "off",
-    "@typescript-eslint/no-namespace": "off",
+    "@typescript-eslint/no-namespace": "error",
     "@typescript-eslint/no-non-null-assertion": "off",
     "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
     "@typescript-eslint/no-useless-constructor": "error",
diff --git a/common/tools/eslint-plugin-azure-sdk/src/configs/index.ts b/common/tools/eslint-plugin-azure-sdk/src/configs/index.ts
index 277f9ed0ad8e..aa70dcea7b73 100644
--- a/common/tools/eslint-plugin-azure-sdk/src/configs/index.ts
+++ b/common/tools/eslint-plugin-azure-sdk/src/configs/index.ts
@@ -47,7 +47,6 @@ export = {
       "@azure/azure-sdk/ts-naming-options": "error",
       "@azure/azure-sdk/ts-naming-subclients": "error",
       "@azure/azure-sdk/ts-no-const-enums": "warn",
-      "@azure/azure-sdk/ts-no-namespaces": "error",
       "@azure/azure-sdk/ts-no-window": "error",
       "@azure/azure-sdk/ts-package-json-author": "error",
       "@azure/azure-sdk/ts-package-json-bugs": "error",
diff --git a/common/tools/eslint-plugin-azure-sdk/src/rules/index.ts b/common/tools/eslint-plugin-azure-sdk/src/rules/index.ts
index e27a8b4ca41c..53f50d6d66f4 100644
--- a/common/tools/eslint-plugin-azure-sdk/src/rules/index.ts
+++ b/common/tools/eslint-plugin-azure-sdk/src/rules/index.ts
@@ -31,7 +31,6 @@ import tsNamingDropNoun from "./ts-naming-drop-noun";
 import tsNamingOptions from "./ts-naming-options";
 import tsNamingSubclients from "./ts-naming-subclients";
 import tsNoConstEnums from "./ts-no-const-enums";
-import tsNoNamespaces from "./ts-no-namespaces";
 import tsNoWindow from "./ts-no-window";
 import tsPackageJsonAuthor from "./ts-package-json-author";
 import tsPackageJsonBugs from "./ts-package-json-bugs";
@@ -82,7 +81,6 @@ export = {
   "ts-naming-options": tsNamingOptions,
   "ts-naming-subclients": tsNamingSubclients,
   "ts-no-const-enums": tsNoConstEnums,
-  "ts-no-namespaces": tsNoNamespaces,
   "ts-no-window": tsNoWindow,
   "ts-package-json-author": tsPackageJsonAuthor,
   "ts-package-json-bugs": tsPackageJsonBugs,
diff --git a/common/tools/eslint-plugin-azure-sdk/src/rules/ts-no-namespaces.ts b/common/tools/eslint-plugin-azure-sdk/src/rules/ts-no-namespaces.ts
deleted file mode 100644
index ff25e8baeadd..000000000000
--- a/common/tools/eslint-plugin-azure-sdk/src/rules/ts-no-namespaces.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT license.
-
-/**
- * @file Rule to forbid usage of TypeScript namespaces.
- * @author Arpan Laha
- */
-
-import { Rule } from "eslint";
-import { getRuleMetaData } from "../utils";
-
-//------------------------------------------------------------------------------
-// Rule Definition
-//------------------------------------------------------------------------------
-
-export = {
-  meta: getRuleMetaData("ts-no-namespaces", "forbid usage of TypeScript namespaces"),
-  create: (context: Rule.RuleContext): Rule.RuleListener =>
-    ({
-      // callback functions
-
-      // report on any TSModuleDeclarations
-      TSModuleDeclaration: (node: any): void => {
-        context.report({
-          node: node,
-          message: "TypeScript namespaces should not be used"
-        });
-      }
-    } as Rule.RuleListener)
-};
diff --git a/common/tools/eslint-plugin-azure-sdk/tests/rules/ts-no-namespaces.ts b/common/tools/eslint-plugin-azure-sdk/tests/rules/ts-no-namespaces.ts
deleted file mode 100644
index 3e3f3b79b6ec..000000000000
--- a/common/tools/eslint-plugin-azure-sdk/tests/rules/ts-no-namespaces.ts
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT license.
-
-/**
- * @file Testing the ts-no-namespaces rule.
- * @author Arpan Laha
- */
-
-import rule from "../../src/rules/ts-no-namespaces";
-import { RuleTester } from "eslint";
-
-//------------------------------------------------------------------------------
-// Tests
-//------------------------------------------------------------------------------
-
-const ruleTester = new RuleTester({
-  parser: require.resolve("@typescript-eslint/parser"),
-  parserOptions: {
-    createDefaultProgram: true,
-    project: "./tsconfig.json",
-    sourceType: "module"
-  },
-  settings: {
-    main: "test.ts"
-  }
-});
-
-ruleTester.run("ts-no-namespaces", rule, {
-  valid: [],
-  invalid: [
-    {
-      code: "namespace Test {}",
-      errors: [
-        {
-          message: "TypeScript namespaces should not be used"
-        }
-      ]
-    },
-    {
-      code: "module Test {}",
-      errors: [
-        {
-          message: "TypeScript namespaces should not be used"
-        }
-      ]
-    }
-  ]
-});
diff --git a/sdk/attestation/attestation/src/jsrsasign.d.ts b/sdk/attestation/attestation/src/jsrsasign.d.ts
index efe75f3bf5e8..0dbc24387264 100644
--- a/sdk/attestation/attestation/src/jsrsasign.d.ts
+++ b/sdk/attestation/attestation/src/jsrsasign.d.ts
@@ -1,5 +1,5 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 declare module 'jsrsasign';
diff --git a/sdk/containerregistry/container-registry/src/utils/base64.browser.ts b/sdk/containerregistry/container-registry/src/utils/base64.browser.ts
index 20b910118e2c..fe0bb1ecad53 100644
--- a/sdk/containerregistry/container-registry/src/utils/base64.browser.ts
+++ b/sdk/containerregistry/container-registry/src/utils/base64.browser.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 declare global {
   function atob(input: string): string;
 }
diff --git a/sdk/core/core-client/src/base64.browser.ts b/sdk/core/core-client/src/base64.browser.ts
index 70f0fdb02292..8185bd2f8f03 100644
--- a/sdk/core/core-client/src/base64.browser.ts
+++ b/sdk/core/core-client/src/base64.browser.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 declare global {
   // stub these out for the browser
   function btoa(input: string): string;
diff --git a/sdk/core/core-http/src/httpOperationResponse.ts b/sdk/core/core-http/src/httpOperationResponse.ts
index 8e59db5f3d6e..56546cd09470 100644
--- a/sdk/core/core-http/src/httpOperationResponse.ts
+++ b/sdk/core/core-http/src/httpOperationResponse.ts
@@ -24,7 +24,7 @@ export interface HttpResponse {
   headers: HttpHeadersLike;
 }
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 declare global {
   /**
    * Stub declaration of the browser-only Blob type.
diff --git a/sdk/core/core-lro/test/utils/router/paramRoutes.ts b/sdk/core/core-lro/test/utils/router/paramRoutes.ts
index cc0bc6406538..c0905f198e2e 100644
--- a/sdk/core/core-lro/test/utils/router/paramRoutes.ts
+++ b/sdk/core/core-lro/test/utils/router/paramRoutes.ts
@@ -224,7 +224,7 @@ function deleteasyncRetry(request: PipelineRequest): PipelineResponse | undefine
   return undefined;
 }
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 namespace deleteasyncRetry {
   export let internalCounter: number = 1; // eslint-disable-line prefer-const
 }
@@ -293,7 +293,7 @@ function putasyncRetry(request: PipelineRequest): PipelineResponse | undefined {
   return undefined;
 }
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 namespace putasyncRetry {
   export let internalCounter: number = 1; // eslint-disable-line prefer-const
 }
@@ -369,7 +369,7 @@ function postasyncRetry(request: PipelineRequest): PipelineResponse | undefined
   return undefined;
 }
 
-// eslint-disable-next-line @azure/azure-sdk/ts-no-namespaces
+// eslint-disable-next-line @typescript-eslint/no-namespace
 namespace postasyncRetry {
   export let internalCounter: number = 1; // eslint-disable-line prefer-const
 }
diff --git a/sdk/eventhub/event-hubs/src/connectionContext.ts b/sdk/eventhub/event-hubs/src/connectionContext.ts
index dfeae5920112..e03a67b686bc 100644
--- a/sdk/eventhub/event-hubs/src/connectionContext.ts
+++ b/sdk/eventhub/event-hubs/src/connectionContext.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-/* eslint-disable @azure/azure-sdk/ts-no-namespaces */
+/* eslint-disable @typescript-eslint/no-namespace */
 /* eslint-disable no-inner-declarations */
 
 import { logger, logErrorStackTrace } from "./log";
diff --git a/sdk/identity/identity/test/internal/node/interactiveBrowserCredential.spec.ts b/sdk/identity/identity/test/internal/node/interactiveBrowserCredential.spec.ts
index 3576e1cabcaf..6d4d594133c7 100644
--- a/sdk/identity/identity/test/internal/node/interactiveBrowserCredential.spec.ts
+++ b/sdk/identity/identity/test/internal/node/interactiveBrowserCredential.spec.ts
@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 /* eslint-disable @typescript-eslint/no-non-null-asserted-optional-chain */
-/* eslint-disable @azure/azure-sdk/ts-no-namespaces */
+/* eslint-disable @typescript-eslint/no-namespace */
 
 import Sinon from "sinon";
 import { assert } from "chai";