diff --git a/docs/api/web-frame-main.md b/docs/api/web-frame-main.md
index 1efcdbe0a180..c349321a2327 100644
--- a/docs/api/web-frame-main.md
+++ b/docs/api/web-frame-main.md
@@ -86,17 +86,6 @@ In the browser window some HTML APIs like `requestFullScreen` can only be
 invoked by a gesture from the user. Setting `userGesture` to `true` will remove
 this limitation.
 
-#### `frame.executeJavaScriptInIsolatedWorld(worldId, code[, userGesture])`
-
-* `worldId` Integer - The ID of the world to run the javascript in, `0` is the default world, `999` is the world used by Electron's `contextIsolation` feature.  You can provide any integer here.
-* `code` String
-* `userGesture` Boolean (optional) - Default is `false`.
-
-Returns `Promise<unknown>` - A promise that resolves with the result of the executed
-code or is rejected if execution throws or results in a rejected promise.
-
-Works like `executeJavaScript` but evaluates `scripts` in an isolated context.
-
 #### `frame.reload()`
 
 Returns `boolean` - Whether the reload was initiated successfully. Only results in `false` when the frame has no history.
diff --git a/shell/browser/api/electron_api_web_frame_main.cc b/shell/browser/api/electron_api_web_frame_main.cc
index 732c50ef61ad..8834eef51c66 100644
--- a/shell/browser/api/electron_api_web_frame_main.cc
+++ b/shell/browser/api/electron_api_web_frame_main.cc
@@ -116,49 +116,6 @@ v8::Local<v8::Promise> WebFrameMain::ExecuteJavaScript(
   return handle;
 }
 
-v8::Local<v8::Promise> WebFrameMain::ExecuteJavaScriptInIsolatedWorld(
-    gin::Arguments* args,
-    int world_id,
-    const base::string16& code) {
-  gin_helper::Promise<base::Value> promise(args->isolate());
-  v8::Local<v8::Promise> handle = promise.GetHandle();
-
-  // Optional userGesture parameter
-  bool user_gesture;
-  if (!args->PeekNext().IsEmpty()) {
-    if (args->PeekNext()->IsBoolean()) {
-      args->GetNext(&user_gesture);
-    } else {
-      args->ThrowTypeError("userGesture must be a boolean");
-      return handle;
-    }
-  } else {
-    user_gesture = false;
-  }
-
-  if (render_frame_disposed_) {
-    promise.RejectWithErrorMessage(
-        "Render frame was disposed before WebFrameMain could be accessed");
-    return handle;
-  }
-
-  if (user_gesture) {
-    auto* ftn = content::FrameTreeNode::From(render_frame_);
-    ftn->UpdateUserActivationState(
-        blink::mojom::UserActivationUpdateType::kNotifyActivation,
-        blink::mojom::UserActivationNotificationType::kTest);
-  }
-
-  render_frame_->ExecuteJavaScriptForTests(
-      code,
-      base::BindOnce([](gin_helper::Promise<base::Value> promise,
-                        base::Value value) { promise.Resolve(value); },
-                     std::move(promise)),
-      world_id);
-
-  return handle;
-}
-
 bool WebFrameMain::Reload() {
   if (!CheckRenderFrame())
     return false;
@@ -365,8 +322,6 @@ v8::Local<v8::ObjectTemplate> WebFrameMain::FillObjectTemplate(
     v8::Local<v8::ObjectTemplate> templ) {
   return gin_helper::ObjectTemplateBuilder(isolate, templ)
       .SetMethod("executeJavaScript", &WebFrameMain::ExecuteJavaScript)
-      .SetMethod("executeJavaScriptInIsolatedWorld",
-                 &WebFrameMain::ExecuteJavaScriptInIsolatedWorld)
       .SetMethod("reload", &WebFrameMain::Reload)
       .SetMethod("_send", &WebFrameMain::Send)
       .SetMethod("_postMessage", &WebFrameMain::PostMessage)
diff --git a/shell/browser/api/electron_api_web_frame_main.h b/shell/browser/api/electron_api_web_frame_main.h
index fd303b48491e..18e7515ec9c2 100644
--- a/shell/browser/api/electron_api_web_frame_main.h
+++ b/shell/browser/api/electron_api_web_frame_main.h
@@ -79,10 +79,6 @@ class WebFrameMain : public gin::Wrappable<WebFrameMain>,
 
   v8::Local<v8::Promise> ExecuteJavaScript(gin::Arguments* args,
                                            const base::string16& code);
-  v8::Local<v8::Promise> ExecuteJavaScriptInIsolatedWorld(
-      gin::Arguments* args,
-      int world_id,
-      const base::string16& code);
   bool Reload();
   void Send(v8::Isolate* isolate,
             bool internal,
diff --git a/spec-main/api-web-frame-main-spec.ts b/spec-main/api-web-frame-main-spec.ts
index 51fe5b13bd15..fa178f3a2018 100644
--- a/spec-main/api-web-frame-main-spec.ts
+++ b/spec-main/api-web-frame-main-spec.ts
@@ -148,19 +148,6 @@ describe('webFrameMain module', () => {
     });
   });
 
-  describe('WebFrame.executeJavaScriptInIsolatedWorld', () => {
-    it('can inject code into any subframe', async () => {
-      const w = new BrowserWindow({ show: false, webPreferences: { contextIsolation: true } });
-      await w.loadFile(path.join(subframesPath, 'frame-with-frame-container.html'));
-      const webFrame = w.webContents.mainFrame;
-
-      const getUrl = (frame: WebFrameMain) => frame.executeJavaScriptInIsolatedWorld(999, 'location.href');
-      expect(await getUrl(webFrame)).to.equal(fileUrl('frame-with-frame-container.html'));
-      expect(await getUrl(webFrame.frames[0])).to.equal(fileUrl('frame-with-frame.html'));
-      expect(await getUrl(webFrame.frames[0].frames[0])).to.equal(fileUrl('frame.html'));
-    });
-  });
-
   describe('WebFrame.reload', () => {
     it('reloads a frame', async () => {
       const w = new BrowserWindow({ show: false, webPreferences: { contextIsolation: true } });