diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 84ef41f4fb97b..15705b59787bf 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -39,6 +39,7 @@ import {
   enableDebugTracing,
   enableFloat,
   enableHostSingletons,
+  enableDO_NOT_USE_disableStrictPassiveEffect,
 } from 'shared/ReactFeatureFlags';
 import {NoFlags, Placement, StaticMask} from './ReactFiberFlags';
 import {ConcurrentRoot} from './ReactRootTags';
@@ -87,6 +88,7 @@ import {
   StrictLegacyMode,
   StrictEffectsMode,
   ConcurrentUpdatesByDefaultMode,
+  NoStrictPassiveEffectsMode,
 } from './ReactTypeOfMode';
 import {
   REACT_FORWARD_REF_TYPE,
@@ -539,6 +541,12 @@ export function createFiberFromTypeAndProps(
         if ((mode & ConcurrentMode) !== NoMode) {
           // Strict effects should never run on legacy roots
           mode |= StrictEffectsMode;
+          if (
+            enableDO_NOT_USE_disableStrictPassiveEffect &&
+            pendingProps.DO_NOT_USE_disableStrictPassiveEffect
+          ) {
+            mode |= NoStrictPassiveEffectsMode;
+          }
         }
         break;
       case REACT_PROFILER_TYPE:
@@ -752,6 +760,10 @@ export function createFiberFromOffscreen(
   lanes: Lanes,
   key: null | string,
 ): Fiber {
+  if (__DEV__) {
+    // StrictMode in Offscreen should always run double passive effects
+    mode &= ~NoStrictPassiveEffectsMode;
+  }
   const fiber = createFiber(OffscreenComponent, pendingProps, key, mode);
   fiber.elementType = REACT_OFFSCREEN_TYPE;
   fiber.lanes = lanes;
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index 7d528709b6e52..53e4b39abd9da 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -58,6 +58,7 @@ import {
   DebugTracingMode,
   StrictEffectsMode,
   StrictLegacyMode,
+  NoStrictPassiveEffectsMode,
 } from './ReactTypeOfMode';
 import {
   NoLane,
@@ -2257,7 +2258,8 @@ function mountEffect(
 ): void {
   if (
     __DEV__ &&
-    (currentlyRenderingFiber.mode & StrictEffectsMode) !== NoMode
+    (currentlyRenderingFiber.mode & StrictEffectsMode) !== NoMode &&
+    (currentlyRenderingFiber.mode & NoStrictPassiveEffectsMode) === NoMode
   ) {
     mountEffectImpl(
       MountPassiveDevEffect | PassiveEffect | PassiveStaticEffect,
diff --git a/packages/react-reconciler/src/ReactTypeOfMode.js b/packages/react-reconciler/src/ReactTypeOfMode.js
index 07e08cff210bd..6da450ffeac6d 100644
--- a/packages/react-reconciler/src/ReactTypeOfMode.js
+++ b/packages/react-reconciler/src/ReactTypeOfMode.js
@@ -9,11 +9,12 @@
 
 export type TypeOfMode = number;
 
-export const NoMode = /*                         */ 0b000000;
+export const NoMode = /*                         */ 0b0000000;
 // TODO: Remove ConcurrentMode by reading from the root tag instead
-export const ConcurrentMode = /*                 */ 0b000001;
-export const ProfileMode = /*                    */ 0b000010;
-export const DebugTracingMode = /*               */ 0b000100;
-export const StrictLegacyMode = /*               */ 0b001000;
-export const StrictEffectsMode = /*              */ 0b010000;
-export const ConcurrentUpdatesByDefaultMode = /* */ 0b100000;
+export const ConcurrentMode = /*                 */ 0b0000001;
+export const ProfileMode = /*                    */ 0b0000010;
+export const DebugTracingMode = /*               */ 0b0000100;
+export const StrictLegacyMode = /*               */ 0b0001000;
+export const StrictEffectsMode = /*              */ 0b0010000;
+export const ConcurrentUpdatesByDefaultMode = /* */ 0b0100000;
+export const NoStrictPassiveEffectsMode = /*     */ 0b1000000;
diff --git a/packages/react-reconciler/src/__tests__/ReactOffscreenStrictMode-test.js b/packages/react-reconciler/src/__tests__/ReactOffscreenStrictMode-test.js
index 129d4d0ddc8e0..f6ef02de522f9 100644
--- a/packages/react-reconciler/src/__tests__/ReactOffscreenStrictMode-test.js
+++ b/packages/react-reconciler/src/__tests__/ReactOffscreenStrictMode-test.js
@@ -55,6 +55,30 @@ describe('ReactOffscreenStrictMode', () => {
     ]);
   });
 
+  // @gate __DEV__ && enableOffscreen
+  it('should trigger strict effects when disableStrictPassiveEffect is presented on StrictMode', async () => {
+    await act(() => {
+      ReactNoop.render(
+        <React.StrictMode DO_NOT_USE_disableStrictPassiveEffect={true}>
+          <Offscreen>
+            <Component label="A" />
+          </Offscreen>
+        </React.StrictMode>,
+      );
+    });
+
+    expect(log).toEqual([
+      'A: render',
+      'A: render',
+      'A: useLayoutEffect mount',
+      'A: useEffect mount',
+      'A: useLayoutEffect unmount',
+      'A: useEffect unmount',
+      'A: useLayoutEffect mount',
+      'A: useEffect mount',
+    ]);
+  });
+
   // @gate __DEV__ && enableOffscreen && useModernStrictMode
   it('should not trigger strict effects when offscreen is hidden', async () => {
     await act(() => {
diff --git a/packages/react/src/__tests__/ReactStrictMode-test.internal.js b/packages/react/src/__tests__/ReactStrictMode-test.internal.js
index 48efe5e7d5fd6..11ed37f599715 100644
--- a/packages/react/src/__tests__/ReactStrictMode-test.internal.js
+++ b/packages/react/src/__tests__/ReactStrictMode-test.internal.js
@@ -104,6 +104,28 @@ describe('ReactStrictMode', () => {
         ]);
       });
 
+      // @gate enableDO_NOT_USE_disableStrictPassiveEffect
+      it('should include legacy + strict effects mode, but not strict passive effect with disableStrictPassiveEffect', async () => {
+        await act(() => {
+          const container = document.createElement('div');
+          const root = ReactDOMClient.createRoot(container);
+          root.render(
+            <React.StrictMode DO_NOT_USE_disableStrictPassiveEffect={true}>
+              <Component label="A" />
+            </React.StrictMode>,
+          );
+        });
+
+        expect(log).toEqual([
+          'A: render',
+          'A: render',
+          'A: useLayoutEffect mount',
+          'A: useEffect mount',
+          'A: useLayoutEffect unmount',
+          'A: useLayoutEffect mount',
+        ]);
+      });
+
       it('should allow level to be increased with nesting', async () => {
         await act(() => {
           const container = document.createElement('div');
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index 7cb339c83cc85..1236429619ae8 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -237,3 +237,4 @@ export const consoleManagedByDevToolsDuringStrictMode = true;
 // components will encounter in production, especially when used With <Offscreen />.
 // TODO: clean up legacy <StrictMode /> once tests pass WWW.
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index e96ce86b00286..0edbf1eea7072 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -82,6 +82,7 @@ export const enableFloat = true;
 export const enableHostSingletons = true;
 
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
 
 export const diffInCommitPhase = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index 97556a05514ce..1ad75cefa4954 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -68,6 +68,7 @@ export const enableFloat = true;
 export const enableHostSingletons = true;
 
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index 6437b4de07086..67d35fbdd1e85 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -68,6 +68,7 @@ export const enableFloat = true;
 export const enableHostSingletons = true;
 
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
index 55535ce5e464d..0954b32e9af0b 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
@@ -66,6 +66,7 @@ export const enableFloat = true;
 export const enableHostSingletons = true;
 
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 
 export const diffInCommitPhase = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 1df2ff6b9eeea..00808854a4d2e 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -70,6 +70,7 @@ export const enableFloat = true;
 export const enableHostSingletons = true;
 
 export const useModernStrictMode = false;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index 58cfcdfff4214..a1197be405837 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -28,6 +28,7 @@ export const enableDeferRootSchedulingToMicrotask = __VARIANT__;
 export const diffInCommitPhase = __VARIANT__;
 export const enableAsyncActions = __VARIANT__;
 export const alwaysThrottleRetries = __VARIANT__;
+export const enableDO_NOT_USE_disableStrictPassiveEffect = __VARIANT__;
 
 // Enable this flag to help with concurrent mode debugging.
 // It logs information to the console about React scheduling, rendering, and commit phases.
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 426a9ec8013e6..36b5236df8319 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -30,6 +30,7 @@ export const {
   diffInCommitPhase,
   enableAsyncActions,
   alwaysThrottleRetries,
+  enableDO_NOT_USE_disableStrictPassiveEffect,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.