diff --git a/Branch-TestBed/Branch-SDK-Tests/BranchClassTests.m b/Branch-TestBed/Branch-SDK-Tests/BranchClassTests.m
index d1e7713f1..cf2bce94c 100644
--- a/Branch-TestBed/Branch-SDK-Tests/BranchClassTests.m
+++ b/Branch-TestBed/Branch-SDK-Tests/BranchClassTests.m
@@ -261,5 +261,102 @@ - (void)testSetConsumerProtectionAttributionLevel {
     
 }
 
+- (void)testSetAnonID {
+    NSString *expectedAnonID = @"static-test-anon-id-12345";
+    
+    [Branch setAnonID:expectedAnonID];
+    
+    NSString *actualAnonID = [BNCPreferenceHelper sharedInstance].anonID;
+    XCTAssertEqualObjects(actualAnonID, expectedAnonID, @"setAnonID should set valid string");
+}
+
+- (void)testSetAnonID_UpdateExistingValue {
+    NSString *initialAnonID = @"initial-anon-id";
+    NSString *updatedAnonID = @"updated-anon-id";
+    
+    [Branch setAnonID:initialAnonID];
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, initialAnonID);
+    
+    [Branch setAnonID:updatedAnonID];
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, updatedAnonID);
+}
+
+- (void)testSetAnonID_NilValue {
+    NSString *initialAnonID = @"initial-anon-id";
+
+    [Branch setAnonID:initialAnonID];
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, initialAnonID);
+    
+    [Branch setAnonID:nil];
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, initialAnonID);
+}
+
+- (void)testSetAnonID_EmptyString {
+    NSString *emptyAnonID = @"";
+    
+    [Branch setAnonID:emptyAnonID];
+    
+    NSString *actualAnonID = [BNCPreferenceHelper sharedInstance].anonID;
+    XCTAssertEqualObjects(actualAnonID, emptyAnonID, @"Static setAnonID should accept empty string");
+}
+
+- (void)testSetAnonID_NonStringObject {
+    NSString *initialAnonID = @"initial-anon-id";
+    
+    [Branch setAnonID:initialAnonID];
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, initialAnonID);
+    
+    // Try to set with a non-string object (NSNumber)
+    NSNumber *nonStringValue = @123;
+    [Branch setAnonID:(NSString *)nonStringValue];
+    
+    XCTAssertEqualObjects([BNCPreferenceHelper sharedInstance].anonID, initialAnonID);
+}
+
+- (void)testSetAnonID_LongString {
+    NSString *longAnonID = @"very-long-anon-id-with-many-characters-to-test-string-handling-1234567890-abcdefghijklmnopqrstuvwxyz";
+    
+    [Branch setAnonID:longAnonID];
+    
+    NSString *actualAnonID = [BNCPreferenceHelper sharedInstance].anonID;
+    XCTAssertEqualObjects(actualAnonID, longAnonID, @"setAnonID should handle long strings");
+}
+
+- (void)testSetAnonID_SpecialCharacters {
+    NSString *specialCharAnonID = @"static-anon-id-with-special-chars-!@#$%^&*()_+-=[]{}|;:,.<>?";
+    
+    [Branch setAnonID:specialCharAnonID];
+    
+    NSString *actualAnonID = [BNCPreferenceHelper sharedInstance].anonID;
+    XCTAssertEqualObjects(actualAnonID, specialCharAnonID, @"setAnonID should handle special characters");
+}
+
+- (void)testSetAnonID_ThreadSafety {
+    NSString *anonID1 = @"thread-test-anon-id-1";
+    NSString *anonID2 = @"thread-test-anon-id-2";
+    
+    // Test that the method is thread-safe by calling it from different queues
+    dispatch_group_t group = dispatch_group_create();
+    
+    dispatch_group_enter(group);
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        [Branch setAnonID:anonID1];
+        dispatch_group_leave(group);
+    });
+    
+    dispatch_group_enter(group);
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        [Branch setAnonID:anonID2];
+        dispatch_group_leave(group);
+    });
+    
+    dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
+    
+    // Verify that one of the values was set (we can't predict which due to concurrency)
+    NSString *finalAnonID = [BNCPreferenceHelper sharedInstance].anonID;
+    XCTAssertTrue([finalAnonID isEqualToString:anonID1] || [finalAnonID isEqualToString:anonID2],
+                  @"One of the anonID values should be set");
+}
+
 
 @end
diff --git a/Sources/BranchSDK/Branch.m b/Sources/BranchSDK/Branch.m
index e0977f8df..32ee69691 100644
--- a/Sources/BranchSDK/Branch.m
+++ b/Sources/BranchSDK/Branch.m
@@ -605,6 +605,16 @@ + (void)setODMInfo:(NSString *)odmInfo andFirstOpenTimestamp:(NSDate *) firstOpe
     
 }
 
++ (void)setAnonID:(NSString *)anonID {
+    @synchronized (self) {
+        if (anonID && [anonID isKindOfClass:[NSString class]]) {
+            [BNCPreferenceHelper sharedInstance].anonID = anonID;
+        } else {
+            [[BranchLogger shared] logWarning:@"Invalid anonID provided. Must be a non-nil NSString." error:nil];
+        }
+    }
+}
+
 - (void)setConsumerProtectionAttributionLevel:(BranchAttributionLevel)level {
     self.preferenceHelper.attributionLevel = level;
     
diff --git a/Sources/BranchSDK/Public/Branch.h b/Sources/BranchSDK/Public/Branch.h
index 75ca5f03a..c75d92216 100644
--- a/Sources/BranchSDK/Public/Branch.h
+++ b/Sources/BranchSDK/Public/Branch.h
@@ -836,6 +836,12 @@ Sets a custom base safetrack URL for non-linking calls to the Branch API.
 
 + (void)setODMInfo:(NSString *)odmInfo andFirstOpenTimestamp:(NSDate *) firstOpenTimestamp;
 
+/**
+ Sets a custom Meta Anon ID for the current user.
+ @param anonID The custom Meta Anon ID to be used by Branch.
+ */
++ (void)setAnonID:(NSString *)anonID;
+
 /**
  * Enumeration representing different levels of consumer protection attribution levels
  */