diff --git a/src/objective-c/GRPCClient/GRPCCall+Cronet.h b/src/objective-c/GRPCClient/GRPCCall+Cronet.h
index d107ada3672..10cea963631 100644
--- a/src/objective-c/GRPCClient/GRPCCall+Cronet.h
+++ b/src/objective-c/GRPCClient/GRPCCall+Cronet.h
@@ -22,7 +22,7 @@
 typedef struct stream_engine stream_engine;
 
 // Transport id for Cronet transport
-extern const GRPCTransportId gGRPCCoreCronetId;
+extern const GRPCTransportID gGRPCCoreCronetId;
 
 // Deprecated class. Please use the gGRPCCoreCronetId with GRPCCallOptions.transport instead.
 @interface GRPCCall (Cronet)
diff --git a/src/objective-c/GRPCClient/GRPCCall+Cronet.m b/src/objective-c/GRPCClient/GRPCCall+Cronet.m
index a732208e1f6..33b09136b33 100644
--- a/src/objective-c/GRPCClient/GRPCCall+Cronet.m
+++ b/src/objective-c/GRPCClient/GRPCCall+Cronet.m
@@ -18,7 +18,7 @@
 
 #import "GRPCCall+Cronet.h"
 
-const GRPCTransportId gGRPCCoreCronetId = "io.grpc.transport.core.cronet";
+const GRPCTransportID gGRPCCoreCronetId = "io.grpc.transport.core.cronet";
 
 static BOOL useCronet = NO;
 static stream_engine *globalCronetEngine;
diff --git a/src/objective-c/GRPCClient/GRPCCallOptions.h b/src/objective-c/GRPCClient/GRPCCallOptions.h
index e4261b5b5f9..adb4ecad48e 100644
--- a/src/objective-c/GRPCClient/GRPCCallOptions.h
+++ b/src/objective-c/GRPCClient/GRPCCallOptions.h
@@ -161,7 +161,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * This is currently an experimental option.
  */
-@property(readonly) GRPCTransportId transport;
+@property(readonly) GRPCTransportID transport;
 
 /**
  * Override the hostname during the TLS hostname validation process.
@@ -339,7 +339,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * An interceptor must not change the value of this option.
  */
-@property(readwrite) GRPCTransportId transport;
+@property(readwrite) GRPCTransportID transport;
 
 /**
  * Override the hostname during the TLS hostname validation process.
diff --git a/src/objective-c/GRPCClient/GRPCCallOptions.m b/src/objective-c/GRPCClient/GRPCCallOptions.m
index 7f88098eb6f..f9044ddcd34 100644
--- a/src/objective-c/GRPCClient/GRPCCallOptions.m
+++ b/src/objective-c/GRPCClient/GRPCCallOptions.m
@@ -42,7 +42,7 @@ static NSString *const kDefaultPEMCertificateChain = nil;
 static NSString *const kDefaultOauth2AccessToken = nil;
 static const id<GRPCAuthorizationProtocol> kDefaultAuthTokenProvider = nil;
 static const GRPCTransportType kDefaultTransportType = GRPCTransportTypeChttp2BoringSSL;
-static const GRPCTransportId kDefaultTransport = NULL;
+static const GRPCTransportID kDefaultTransport = NULL;
 static NSString *const kDefaultHostNameOverride = nil;
 static const id kDefaultLogContext = nil;
 static NSString *const kDefaultChannelPoolDomain = nil;
@@ -82,7 +82,7 @@ static BOOL areObjectsEqual(id obj1, id obj2) {
   NSString *_PEMPrivateKey;
   NSString *_PEMCertificateChain;
   GRPCTransportType _transportType;
-  GRPCTransportId _transport;
+  GRPCTransportID _transport;
   NSString *_hostNameOverride;
   id<NSObject> _logContext;
   NSString *_channelPoolDomain;
@@ -166,7 +166,7 @@ static BOOL areObjectsEqual(id obj1, id obj2) {
                           PEMPrivateKey:(NSString *)PEMPrivateKey
                     PEMCertificateChain:(NSString *)PEMCertificateChain
                           transportType:(GRPCTransportType)transportType
-                              transport:(GRPCTransportId)transport
+                              transport:(GRPCTransportID)transport
                        hostNameOverride:(NSString *)hostNameOverride
                              logContext:(id)logContext
                       channelPoolDomain:(NSString *)channelPoolDomain
@@ -553,7 +553,7 @@ static BOOL areObjectsEqual(id obj1, id obj2) {
   _transportType = transportType;
 }
 
-- (void)setTransport:(GRPCTransportId)transport {
+- (void)setTransport:(GRPCTransportID)transport {
   _transport = transport;
 }
 
diff --git a/src/objective-c/GRPCClient/GRPCInterceptor.h b/src/objective-c/GRPCClient/GRPCInterceptor.h
index 509749769b3..1794ef4b892 100644
--- a/src/objective-c/GRPCClient/GRPCInterceptor.h
+++ b/src/objective-c/GRPCClient/GRPCInterceptor.h
@@ -177,7 +177,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (nullable instancetype)initWithFactories:(nullable NSArray<id<GRPCInterceptorFactory>> *)factories
                        previousInterceptor:(nullable id<GRPCResponseHandler>)previousInterceptor
-                               transportId:(GRPCTransportId)transportId;
+                               transportId:(GRPCTransportID)transportId;
 
 /**
  * Notify the manager that the interceptor has shut down and the manager should release references
diff --git a/src/objective-c/GRPCClient/GRPCInterceptor.m b/src/objective-c/GRPCClient/GRPCInterceptor.m
index a7ffe05bddc..abada5a80c1 100644
--- a/src/objective-c/GRPCClient/GRPCInterceptor.m
+++ b/src/objective-c/GRPCClient/GRPCInterceptor.m
@@ -31,13 +31,13 @@
   GRPCInterceptor *_thisInterceptor;
   dispatch_queue_t _dispatchQueue;
   NSArray<id<GRPCInterceptorFactory>> *_factories;
-  GRPCTransportId _transportId;
+  GRPCTransportID _transportId;
   BOOL _shutDown;
 }
 
 - (instancetype)initWithFactories:(NSArray<id<GRPCInterceptorFactory>> *)factories
               previousInterceptor:(id<GRPCResponseHandler>)previousInterceptor
-                      transportId:(nonnull GRPCTransportId)transportId {
+                      transportId:(nonnull GRPCTransportID)transportId {
   if ((self = [super init])) {
     if (factories.count == 0) {
       [NSException raise:NSInternalInconsistencyException
diff --git a/src/objective-c/GRPCClient/GRPCTransport.h b/src/objective-c/GRPCClient/GRPCTransport.h
index d5637922152..d9f341d08a3 100644
--- a/src/objective-c/GRPCClient/GRPCTransport.h
+++ b/src/objective-c/GRPCClient/GRPCTransport.h
@@ -29,15 +29,15 @@ NS_ASSUME_NONNULL_BEGIN
  * by gRPC by default unless explicitly excluded.
  */
 extern const struct GRPCDefaultTransportImplList {
-  const GRPCTransportId core_secure;
-  const GRPCTransportId core_insecure;
+  const GRPCTransportID core_secure;
+  const GRPCTransportID core_insecure;
 } GRPCDefaultTransportImplList;
 
 /** Returns whether two transport id's are identical. */
-BOOL TransportIdIsEqual(GRPCTransportId lhs, GRPCTransportId rhs);
+BOOL TransportIdIsEqual(GRPCTransportID lhs, GRPCTransportID rhs);
 
 /** Returns the hash value of a transport id. */
-NSUInteger TransportIdHash(GRPCTransportId);
+NSUInteger TransportIdHash(GRPCTransportID);
 
 #pragma mark Transport and factory
 
@@ -66,7 +66,7 @@ NSUInteger TransportIdHash(GRPCTransportId);
  * Parameter \a transportId is the identifier of the implementation, and \a factory is the factory
  * object to create the corresponding transport instance.
  */
-- (void)registerTransportWithId:(GRPCTransportId)transportId
+- (void)registerTransportWithId:(GRPCTransportID)transportId
                         factory:(id<GRPCTransportFactory>)factory;
 
 @end
diff --git a/src/objective-c/GRPCClient/GRPCTransport.m b/src/objective-c/GRPCClient/GRPCTransport.m
index 439acfb9cc2..966dc50d64d 100644
--- a/src/objective-c/GRPCClient/GRPCTransport.m
+++ b/src/objective-c/GRPCClient/GRPCTransport.m
@@ -18,24 +18,24 @@
 
 #import "GRPCTransport.h"
 
-static const GRPCTransportId gGRPCCoreSecureId = "io.grpc.transport.core.secure";
-static const GRPCTransportId gGRPCCoreInsecureId = "io.grpc.transport.core.insecure";
+static const GRPCTransportID gGRPCCoreSecureId = "io.grpc.transport.core.secure";
+static const GRPCTransportID gGRPCCoreInsecureId = "io.grpc.transport.core.insecure";
 
 const struct GRPCDefaultTransportImplList GRPCDefaultTransportImplList = {
     .core_secure = gGRPCCoreSecureId, .core_insecure = gGRPCCoreInsecureId};
 
-static const GRPCTransportId gDefaultTransportId = gGRPCCoreSecureId;
+static const GRPCTransportID gDefaultTransportId = gGRPCCoreSecureId;
 
 static GRPCTransportRegistry *gTransportRegistry = nil;
 static dispatch_once_t initTransportRegistry;
 
-BOOL TransportIdIsEqual(GRPCTransportId lhs, GRPCTransportId rhs) {
+BOOL TransportIdIsEqual(GRPCTransportID lhs, GRPCTransportID rhs) {
   // Directly comparing pointers works because we require users to use the id provided by each
   // implementation, not coming up with their own string.
   return lhs == rhs;
 }
 
-NSUInteger TransportIdHash(GRPCTransportId transportId) {
+NSUInteger TransportIdHash(GRPCTransportID transportId) {
   if (transportId == NULL) {
     transportId = gDefaultTransportId;
   }
@@ -66,7 +66,7 @@ NSUInteger TransportIdHash(GRPCTransportId transportId) {
   return self;
 }
 
-- (void)registerTransportWithId:(GRPCTransportId)transportId
+- (void)registerTransportWithId:(GRPCTransportID)transportId
                         factory:(id<GRPCTransportFactory>)factory {
   NSString *nsTransportId = [NSString stringWithCString:transportId encoding:NSUTF8StringEncoding];
   NSAssert(_registry[nsTransportId] == nil, @"The transport %@ has already been registered.",
@@ -83,7 +83,7 @@ NSUInteger TransportIdHash(GRPCTransportId transportId) {
   }
 }
 
-- (id<GRPCTransportFactory>)getTransportFactoryWithId:(GRPCTransportId)transportId {
+- (id<GRPCTransportFactory>)getTransportFactoryWithId:(GRPCTransportID)transportId {
   if (transportId == NULL) {
     if (_defaultFactory == nil) {
       [NSException raise:NSInvalidArgumentException
diff --git a/src/objective-c/GRPCClient/GRPCTypes.h b/src/objective-c/GRPCClient/GRPCTypes.h
index c804bca4eaa..8d434851aa6 100644
--- a/src/objective-c/GRPCClient/GRPCTypes.h
+++ b/src/objective-c/GRPCClient/GRPCTypes.h
@@ -171,7 +171,7 @@ extern NSString* _Nonnull const kGRPCHeadersKey;
 extern NSString* _Nonnull const kGRPCTrailersKey;
 
 /** The id of a transport implementation. */
-typedef char* _Nonnull GRPCTransportId;
+typedef char* _Nonnull GRPCTransportID;
 
 /**
  * Implement this protocol to provide a token to gRPC when a call is initiated.
diff --git a/src/objective-c/GRPCClient/private/GRPCTransport+Private.h b/src/objective-c/GRPCClient/private/GRPCTransport+Private.h
index 2dc7357c363..075d185e5d7 100644
--- a/src/objective-c/GRPCClient/private/GRPCTransport+Private.h
+++ b/src/objective-c/GRPCClient/private/GRPCTransport+Private.h
@@ -31,13 +31,13 @@ NS_ASSUME_NONNULL_BEGIN
  * registered with the registry, the default transport factory (core + secure) is returned. If the
  * default transport does not exist, an exception is thrown.
  */
-- (id<GRPCTransportFactory>)getTransportFactoryWithId:(GRPCTransportId)transportId;
+- (id<GRPCTransportFactory>)getTransportFactoryWithId:(GRPCTransportID)transportId;
 
 @end
 
 @interface GRPCTransportManager : NSObject<GRPCInterceptorInterface>
 
-- (instancetype)initWithTransportId:(GRPCTransportId)transportId
+- (instancetype)initWithTransportId:(GRPCTransportID)transportId
                 previousInterceptor:(id<GRPCResponseHandler>)previousInterceptor;
 
 /**
diff --git a/src/objective-c/GRPCClient/private/GRPCTransport+Private.m b/src/objective-c/GRPCClient/private/GRPCTransport+Private.m
index 9072f7afbe2..5e9c2b52ab4 100644
--- a/src/objective-c/GRPCClient/private/GRPCTransport+Private.m
+++ b/src/objective-c/GRPCClient/private/GRPCTransport+Private.m
@@ -21,13 +21,13 @@
 #import <GRPCClient/GRPCTransport.h>
 
 @implementation GRPCTransportManager {
-  GRPCTransportId _transportId;
+  GRPCTransportID _transportId;
   GRPCTransport *_transport;
   id<GRPCResponseHandler> _previousInterceptor;
   dispatch_queue_t _dispatchQueue;
 }
 
-- (instancetype)initWithTransportId:(GRPCTransportId)transportId
+- (instancetype)initWithTransportId:(GRPCTransportID)transportId
                 previousInterceptor:(id<GRPCResponseHandler>)previousInterceptor {
   if ((self = [super init])) {
     id<GRPCTransportFactory> factory =
diff --git a/src/objective-c/tests/CronetTests/InteropTestsRemoteWithCronet.m b/src/objective-c/tests/CronetTests/InteropTestsRemoteWithCronet.m
index aa1af301b96..f4cd9e064d2 100644
--- a/src/objective-c/tests/CronetTests/InteropTestsRemoteWithCronet.m
+++ b/src/objective-c/tests/CronetTests/InteropTestsRemoteWithCronet.m
@@ -52,7 +52,7 @@ static int32_t kRemoteInteropServerOverhead = 12;
   return kRemoteSSLHost;
 }
 
-+ (GRPCTransportId)transport {
++ (GRPCTransportID)transport {
   return gGRPCCoreCronetId;
 }
 
diff --git a/src/objective-c/tests/InteropTests/InteropTests.h b/src/objective-c/tests/InteropTests/InteropTests.h
index a4adecd5415..4ebce5c961d 100644
--- a/src/objective-c/tests/InteropTests/InteropTests.h
+++ b/src/objective-c/tests/InteropTests/InteropTests.h
@@ -59,7 +59,7 @@
  * The transport to be used. The base implementation returns NULL. Subclasses should override to
  * appropriate settings.
  */
-+ (GRPCTransportId)transport;
++ (GRPCTransportID)transport;
 
 /**
  * The root certificates to be used. The base implementation returns nil. Subclasses should override
diff --git a/src/objective-c/tests/InteropTests/InteropTests.m b/src/objective-c/tests/InteropTests/InteropTests.m
index 21198f7bad9..0c7ef44e0fa 100644
--- a/src/objective-c/tests/InteropTests/InteropTests.m
+++ b/src/objective-c/tests/InteropTests/InteropTests.m
@@ -404,7 +404,7 @@ static dispatch_once_t initGlobalInterceptorFactory;
   return GRPCTransportTypeChttp2BoringSSL;
 }
 
-+ (GRPCTransportId)transport {
++ (GRPCTransportID)transport {
   return NULL;
 }
 
diff --git a/src/objective-c/tests/InteropTests/InteropTestsLocalCleartext.m b/src/objective-c/tests/InteropTests/InteropTestsLocalCleartext.m
index 2e638099e1e..23f39401230 100644
--- a/src/objective-c/tests/InteropTests/InteropTestsLocalCleartext.m
+++ b/src/objective-c/tests/InteropTests/InteropTestsLocalCleartext.m
@@ -61,7 +61,7 @@ static int32_t kLocalInteropServerOverhead = 10;
   [GRPCCall useInsecureConnectionsForHost:kLocalCleartextHost];
 }
 
-+ (GRPCTransportId)transport {
++ (GRPCTransportID)transport {
   return GRPCDefaultTransportImplList.core_insecure;
 }
 
diff --git a/src/objective-c/tests/InteropTests/InteropTestsLocalSSL.m b/src/objective-c/tests/InteropTests/InteropTestsLocalSSL.m
index 30d8f4c34af..9c8ce7fe810 100644
--- a/src/objective-c/tests/InteropTests/InteropTestsLocalSSL.m
+++ b/src/objective-c/tests/InteropTests/InteropTestsLocalSSL.m
@@ -57,7 +57,7 @@ static int32_t kLocalInteropServerOverhead = 10;
   return kLocalInteropServerOverhead;  // bytes
 }
 
-+ (GRPCTransportId)transport {
++ (GRPCTransportID)transport {
   return GRPCDefaultTransportImplList.core_secure;
 }