diff --git a/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.h b/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.h
new file mode 100644
index 00000000000000..c3886a109ac5ee
--- /dev/null
+++ b/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#if TARGET_OS_OSX // [macOS
+#import <AppKit/AppKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RCTAppearanceProxy : NSObject
+
++ (instancetype)sharedInstance;
+
+/*
+ * Property to access the current appearance.
+ * Thread safe.
+ */
+@property (nonatomic, readonly) NSAppearance *currentAppearance;
+
+- (void)startObservingAppearance;
+
+@end
+
+NS_ASSUME_NONNULL_END
+#endif // macOS]
diff --git a/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.mm b/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.mm
new file mode 100644
index 00000000000000..9e25b3604f996f
--- /dev/null
+++ b/packages/react-native/React/Base/UIKitProxies/RCTAppearanceProxy.mm
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) Microsoft Corporation.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#if TARGET_OS_OSX // [macOS
+#import "RCTAppearanceProxy.h"
+
+#import <React/RCTConstants.h>
+#import <React/RCTUtils.h>
+
+#import <mutex>
+
+@implementation RCTAppearanceProxy {
+  BOOL _isObserving;
+  std::mutex _mutex;
+  NSAppearance *_currentAppearance;
+}
+
++ (instancetype)sharedInstance
+{
+  static RCTAppearanceProxy *sharedInstance = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    sharedInstance = [RCTAppearanceProxy new];
+  });
+  return sharedInstance;
+}
+
+- (instancetype)init
+{
+  self = [super init];
+  if (self) {
+    _isObserving = NO;
+    _currentAppearance = [NSApp effectiveAppearance];
+  }
+  return self;
+}
+
+- (void)startObservingAppearance
+{
+  RCTAssertMainQueue();
+  std::lock_guard<std::mutex> lock(_mutex);
+  if (!_isObserving) {
+    _isObserving = YES;
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(_appearanceDidChange:)
+                                                 name:RCTUserInterfaceStyleDidChangeNotification
+                                               object:nil];
+  }
+}
+
+- (NSAppearance *)currentAppearance
+{
+  {
+    std::lock_guard<std::mutex> lock(_mutex);
+    if (_isObserving) {
+      return _currentAppearance;
+    }
+  }
+
+  __block NSAppearance *appearance = nil;
+  if (RCTIsMainQueue()) {
+    appearance = [NSApp effectiveAppearance];
+  } else {
+    dispatch_sync(dispatch_get_main_queue(), ^{
+      appearance = [NSApp effectiveAppearance];
+    });
+  }
+  return appearance;
+}
+
+- (void)_appearanceDidChange:(NSNotification *)notification
+{
+  std::lock_guard<std::mutex> lock(_mutex);
+
+  NSDictionary *userInfo = [notification userInfo];
+  if (userInfo) {
+    NSAppearance *appearance = userInfo[RCTUserInterfaceStyleDidChangeNotificationAppearanceKey];
+    if (appearance != nil) {
+      _currentAppearance = appearance;
+      return;
+    }
+  }
+
+  _currentAppearance = [NSApp effectiveAppearance];
+}
+
+@end
+#endif // macOS]
diff --git a/packages/react-native/React/Base/UIKitProxies/RCTInitializeUIKitProxies.mm b/packages/react-native/React/Base/UIKitProxies/RCTInitializeUIKitProxies.mm
index 09dfb43d4ab2da..4e059fab360340 100644
--- a/packages/react-native/React/Base/UIKitProxies/RCTInitializeUIKitProxies.mm
+++ b/packages/react-native/React/Base/UIKitProxies/RCTInitializeUIKitProxies.mm
@@ -10,6 +10,9 @@
 #import "RCTKeyWindowValuesProxy.h"
 #import "RCTTraitCollectionProxy.h"
 #import "RCTWindowSafeAreaProxy.h"
+#if TARGET_OS_OSX // [macOS
+#import "RCTAppearanceProxy.h"
+#endif // macOS]
 
 void RCTInitializeUIKitProxies(void)
 {
@@ -19,7 +22,9 @@ void RCTInitializeUIKitProxies(void)
 #if !TARGET_OS_OSX // [macOS]
     [[RCTTraitCollectionProxy sharedInstance] startObservingTraitCollection];
     [[RCTInitialAccessibilityValuesProxy sharedInstance] recordAccessibilityValues];
-#endif // [macOS]
+#else // [macOS
+    [[RCTAppearanceProxy sharedInstance] startObservingAppearance];
+#endif // macOS]
     [[RCTKeyWindowValuesProxy sharedInstance] startObservingWindowSizeIfNecessary];
   });
 }
diff --git a/packages/react-native/React/CoreModules/RCTAppearance.mm b/packages/react-native/React/CoreModules/RCTAppearance.mm
index 4053d54a9e1a12..857c18d6ce5650 100644
--- a/packages/react-native/React/CoreModules/RCTAppearance.mm
+++ b/packages/react-native/React/CoreModules/RCTAppearance.mm
@@ -14,6 +14,12 @@
 
 #import "CoreModulesPlugins.h"
 
+#if TARGET_OS_OSX // [macOS
+#import <React/RCTUtils.h>
+
+#import "RCTAppearanceProxy.h"
+#endif // macOS]
+
 using namespace facebook::react;
 
 NSString *const RCTAppearanceColorSchemeLight = @"light";
@@ -119,7 +125,7 @@ - (instancetype)init
     UITraitCollection *traitCollection = [RCTTraitCollectionProxy sharedInstance].currentTraitCollection;
     _currentColorScheme = RCTColorSchemePreference(traitCollection);
 #else // [macOS
-  NSAppearance *appearance = RCTSharedApplication().appearance;
+  NSAppearance *appearance = [RCTAppearanceProxy sharedInstance].currentAppearance;
   _currentColorScheme = RCTColorSchemePreference(appearance);
 #endif // macOS]
     [[NSNotificationCenter defaultCenter] addObserver:self
@@ -134,7 +140,11 @@ - (instancetype)init
 
 + (BOOL)requiresMainQueueSetup
 {
+#if !TARGET_OS_OSX // [macOS]
   return NO;
+#else // [macOS
+  return YES;
+#endif // macOS]
 }
 
 - (dispatch_queue_t)methodQueue
@@ -160,13 +170,15 @@ - (dispatch_queue_t)methodQueue
     window.overrideUserInterfaceStyle = userInterfaceStyle;
   }
 #else // [macOS
-  NSAppearance *appearance = nil;
-  if ([style isEqualToString:@"light"]) {
-    appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua];
-  } else if ([style isEqualToString:@"dark"]) {
-    appearance = [NSAppearance appearanceNamed:NSAppearanceNameDarkAqua];
-  }
-  RCTSharedApplication().appearance = appearance;
+  RCTExecuteOnMainQueue(^{
+    NSAppearance *appearance = nil;
+    if ([style isEqualToString:@"light"]) {
+      appearance = [NSAppearance appearanceNamed:NSAppearanceNameAqua];
+    } else if ([style isEqualToString:@"dark"]) {
+      appearance = [NSAppearance appearanceNamed:NSAppearanceNameDarkAqua];
+    }
+    RCTSharedApplication().appearance = appearance;
+  });
 #endif // macOS]
 }
 
@@ -177,10 +189,7 @@ - (dispatch_queue_t)methodQueue
     UITraitCollection *traitCollection = [RCTTraitCollectionProxy sharedInstance].currentTraitCollection;
     _currentColorScheme = RCTColorSchemePreference(traitCollection);
 #else // [macOS
-    __block NSAppearance *appearance = nil;
-    RCTUnsafeExecuteOnMainQueueSync(^{
-      appearance = RCTKeyWindow().appearance;
-    });
+    NSAppearance *appearance = [RCTAppearanceProxy sharedInstance].currentAppearance;
     _currentColorScheme = RCTColorSchemePreference(appearance);
 #endif // macOS]
   }
@@ -190,23 +199,19 @@ - (dispatch_queue_t)methodQueue
 
 - (void)appearanceChanged:(NSNotification *)notification
 {
+#if !TARGET_OS_OSX // [macOS
   NSDictionary *userInfo = [notification userInfo];
-#if !TARGET_OS_OSX // [macOS]
   UITraitCollection *traitCollection = nil;
   if (userInfo) {
     traitCollection = userInfo[RCTUserInterfaceStyleDidChangeNotificationTraitCollectionKey];
   }
   NSString *newColorScheme = RCTColorSchemePreference(traitCollection);
 #else // [macOS
-  NSAppearance *appearance = nil;
-  if (userInfo) {
-    appearance = userInfo[RCTUserInterfaceStyleDidChangeNotificationAppearanceKey];
-  }
-  NSString *newColorScheme = RCTColorSchemePreference(appearance);
+  NSString *newColorScheme = RCTColorSchemePreference([RCTAppearanceProxy sharedInstance].currentAppearance);
 #endif // macOS]
   if (![_currentColorScheme isEqualToString:newColorScheme]) {
     _currentColorScheme = newColorScheme;
-    [self sendEventWithName:@"appearanceChanged" body:@{@"colorScheme" : newColorScheme}];
+    [self sendEventWithName:@"appearanceChanged" body:@{ @"colorScheme" : newColorScheme }];
   }
 }
 
diff --git a/packages/react-native/React/CoreModules/RCTDeviceInfo.mm b/packages/react-native/React/CoreModules/RCTDeviceInfo.mm
index 17e2d983daf850..3dce6f0b53060a 100644
--- a/packages/react-native/React/CoreModules/RCTDeviceInfo.mm
+++ b/packages/react-native/React/CoreModules/RCTDeviceInfo.mm
@@ -50,7 +50,11 @@ - (instancetype)init
 
 + (BOOL)requiresMainQueueSetup
 {
+#if !TARGET_OS_OSX // [macOS]
   return NO;
+#else // [macOS
+  return YES;
+#endif // macOS]
 }
 
 - (dispatch_queue_t)methodQueue