diff --git a/React/CoreModules/RCTDevMenu.mm b/React/CoreModules/RCTDevMenu.mm
index f66232cd0c61aa..46a8c55388e392 100644
--- a/React/CoreModules/RCTDevMenu.mm
+++ b/React/CoreModules/RCTDevMenu.mm
@@ -249,28 +249,12 @@ - (void)setDefaultJSBundle
     } else {
       [items addObject:[RCTDevMenuItem
                            buttonItemWithTitleBlock:^NSString * {
-                             if (devSettings.isNuclideDebuggingAvailable) {
-                               return devSettings.isDebuggingRemotely ? @"Stop Chrome Debugger" : @"Debug with Chrome";
-                             } else {
-                               return devSettings.isDebuggingRemotely ? @"Stop Debugging" : @"Debug";
-                             }
+                             return devSettings.isDebuggingRemotely ? @"Stop Debugging" : @"Debug";
                            }
                            handler:^{
                              devSettings.isDebuggingRemotely = !devSettings.isDebuggingRemotely;
                            }]];
     }
-
-    if (devSettings.isNuclideDebuggingAvailable && !devSettings.isDebuggingRemotely) {
-      [items addObject:[RCTDevMenuItem buttonItemWithTitle:@"Debug with Nuclide"
-                                                   handler:^{
-#if RCT_ENABLE_INSPECTOR
-                                                     [RCTInspectorDevServerHelper
-                                                         attachDebugger:@"ReactNative"
-                                                          withBundleURL:bridge.bundleURL
-                                                               withView:RCTPresentedViewController()];
-#endif
-                                                   }]];
-    }
   }
 
   [items addObject:[RCTDevMenuItem
diff --git a/React/DevSupport/RCTInspectorDevServerHelper.h b/React/DevSupport/RCTInspectorDevServerHelper.h
index 9cf04a5bdf5acc..c50051bb0f69dc 100644
--- a/React/DevSupport/RCTInspectorDevServerHelper.h
+++ b/React/DevSupport/RCTInspectorDevServerHelper.h
@@ -17,7 +17,6 @@
 
 + (RCTInspectorPackagerConnection *)connectWithBundleURL:(NSURL *)bundleURL;
 + (void)disableDebugger;
-+ (void)attachDebugger:(NSString *)owner withBundleURL:(NSURL *)bundleURL withView:(UIViewController *)view;
 @end
 
 #endif
diff --git a/React/DevSupport/RCTInspectorDevServerHelper.mm b/React/DevSupport/RCTInspectorDevServerHelper.mm
index b6c2ac621f9000..7d7212ffbcf30f 100644
--- a/React/DevSupport/RCTInspectorDevServerHelper.mm
+++ b/React/DevSupport/RCTInspectorDevServerHelper.mm
@@ -49,24 +49,6 @@
                                                          escapedAppName]];
 }
 
-static NSURL *getAttachDeviceUrl(NSURL *bundleURL, NSString *title)
-{
-  NSNumber *metroBundlerPort = @8081;
-  NSString *metroBundlerPortStr = [[[NSProcessInfo processInfo] environment] objectForKey:@"RCT_METRO_PORT"];
-  if (metroBundlerPortStr && [metroBundlerPortStr length] > 0) {
-    metroBundlerPort = [NSNumber numberWithInt:[metroBundlerPortStr intValue]];
-  }
-  NSString *escapedDeviceName = [[[UIDevice currentDevice] name]
-      stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet.URLHostAllowedCharacterSet];
-  NSString *escapedAppName = [[[NSBundle mainBundle] bundleIdentifier]
-      stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet.URLHostAllowedCharacterSet];
-  return [NSURL URLWithString:[NSString stringWithFormat:@"http://%@/attach-debugger-nuclide?title=%@&device=%@&app=%@",
-                                                         getServerHost(bundleURL, metroBundlerPort),
-                                                         title,
-                                                         escapedDeviceName,
-                                                         escapedAppName]];
-}
-
 @implementation RCTInspectorDevServerHelper
 
 RCT_NOT_IMPLEMENTED(-(instancetype)init)
@@ -80,36 +62,6 @@ static void sendEventToAllConnections(NSString *event)
   }
 }
 
-static void displayErrorAlert(UIViewController *view, NSString *message)
-{
-  UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
-                                                                 message:message
-                                                          preferredStyle:UIAlertControllerStyleAlert];
-  [view presentViewController:alert animated:YES completion:nil];
-  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * 2.5), dispatch_get_main_queue(), ^{
-    [alert dismissViewControllerAnimated:YES completion:nil];
-  });
-}
-
-+ (void)attachDebugger:(NSString *)owner withBundleURL:(NSURL *)bundleURL withView:(UIViewController *)view
-{
-  NSURL *url = getAttachDeviceUrl(bundleURL, owner);
-
-  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
-  [request setHTTPMethod:@"GET"];
-
-  __weak UIViewController *viewCapture = view;
-  [[[NSURLSession sharedSession]
-      dataTaskWithRequest:request
-        completionHandler:^(
-            __unused NSData *_Nullable data, __unused NSURLResponse *_Nullable response, NSError *_Nullable error) {
-          UIViewController *viewCaptureStrong = viewCapture;
-          if (error != nullptr && viewCaptureStrong != nullptr) {
-            displayErrorAlert(viewCaptureStrong, @"The request to attach Nuclide couldn't reach Metro!");
-          }
-        }] resume];
-}
-
 + (void)disableDebugger
 {
   sendEventToAllConnections(kDebuggerMsgDisable);
diff --git a/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java b/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
index c40242077cf4e9..f80ae648404005 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
@@ -7,13 +7,10 @@
 
 package com.facebook.react.devsupport;
 
-import android.content.Context;
 import android.os.AsyncTask;
-import android.widget.Toast;
 import androidx.annotation.Nullable;
 import com.facebook.common.logging.FLog;
 import com.facebook.infer.annotation.Assertions;
-import com.facebook.react.R;
 import com.facebook.react.common.ReactConstants;
 import com.facebook.react.devsupport.interfaces.DevBundleDownloadListener;
 import com.facebook.react.devsupport.interfaces.PackagerStatusCallback;
@@ -250,36 +247,6 @@ protected Void doInBackground(Void... params) {
     }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
   }
 
-  public void attachDebugger(final Context context, final String title) {
-    new AsyncTask<Void, String, Boolean>() {
-      @Override
-      protected Boolean doInBackground(Void... ignore) {
-        return doSync();
-      }
-
-      public boolean doSync() {
-        try {
-          String attachToNuclideUrl = getInspectorAttachUrl(context, title);
-          OkHttpClient client = new OkHttpClient();
-          Request request = new Request.Builder().url(attachToNuclideUrl).build();
-          client.newCall(request).execute();
-          return true;
-        } catch (IOException e) {
-          FLog.e(ReactConstants.TAG, "Failed to send attach request to Inspector", e);
-          return false;
-        }
-      }
-
-      @Override
-      protected void onPostExecute(Boolean result) {
-        if (!result) {
-          String message = context.getString(R.string.catalyst_debug_nuclide_error);
-          Toast.makeText(context, message, Toast.LENGTH_LONG).show();
-        }
-      }
-    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
-  }
-
   public void symbolicateStackTrace(
       Iterable<StackFrame> stackFrames, final SymbolicationListener listener) {
     try {
@@ -370,16 +337,6 @@ private String getInspectorDeviceUrl() {
         mPackageName);
   }
 
-  private String getInspectorAttachUrl(Context context, String title) {
-    return String.format(
-        Locale.US,
-        "http://%s/nuclide/attach-debugger-nuclide?title=%s&app=%s&device=%s",
-        AndroidInfoHelpers.getServerHost(context),
-        title,
-        mPackageName,
-        AndroidInfoHelpers.getFriendlyDeviceName());
-  }
-
   public void downloadBundleFromURL(
       DevBundleDownloadListener callback,
       File outputFile,
diff --git a/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.java b/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.java
index c29483bae32470..249a359230dcc6 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.java
@@ -433,13 +433,9 @@ public void onOptionSelected() {
           }
         });
     options.put(
-        mDevSettings.isNuclideJSDebugEnabled()
-            ? mDevSettings.isRemoteJSDebugEnabled()
-                ? mApplicationContext.getString(R.string.catalyst_debug_chrome_stop)
-                : mApplicationContext.getString(R.string.catalyst_debug_chrome)
-            : mDevSettings.isRemoteJSDebugEnabled()
-                ? mApplicationContext.getString(R.string.catalyst_debug_stop)
-                : mApplicationContext.getString(R.string.catalyst_debug),
+        mDevSettings.isRemoteJSDebugEnabled()
+            ? mApplicationContext.getString(R.string.catalyst_debug_stop)
+            : mApplicationContext.getString(R.string.catalyst_debug),
         new DevOptionHandler() {
           @Override
           public void onOptionSelected() {
@@ -447,16 +443,6 @@ public void onOptionSelected() {
             handleReloadJS();
           }
         });
-    if (mDevSettings.isNuclideJSDebugEnabled()) {
-      options.put(
-          mApplicationContext.getString(R.string.catalyst_debug_nuclide),
-          new DevOptionHandler() {
-            @Override
-            public void onOptionSelected() {
-              mDevServerHelper.attachDebugger(mApplicationContext, "ReactNative");
-            }
-          });
-    }
     options.put(
         mApplicationContext.getString(R.string.catalyst_change_bundle_location),
         new DevOptionHandler() {