diff --git a/include/grpcpp/security/tls_credentials_options.h b/include/grpcpp/security/tls_credentials_options.h
index 76ff9ed2939..3e9b037ec25 100644
--- a/include/grpcpp/security/tls_credentials_options.h
+++ b/include/grpcpp/security/tls_credentials_options.h
@@ -125,7 +125,7 @@ struct TlsCredentialReloadInterface {
   /** A callback that invokes the credential reload. **/
   virtual int Schedule(TlsCredentialReloadArg* arg) = 0;
   /** A callback that cancels a credential reload request. **/
-  virtual void Cancel(TlsCredentialReloadArg* arg) {}
+  virtual void Cancel(TlsCredentialReloadArg* /* arg */) {}
 };
 
 /** TLS credential reloag config, wraps grpc_tls_credential_reload_config. It is
@@ -227,7 +227,7 @@ struct TlsServerAuthorizationCheckInterface {
   /** A callback that invokes the server authorization check. **/
   virtual int Schedule(TlsServerAuthorizationCheckArg* arg) = 0;
   /** A callback that cancels a server authorization check request. **/
-  virtual void Cancel(TlsServerAuthorizationCheckArg* arg) {}
+  virtual void Cancel(TlsServerAuthorizationCheckArg* /* arg */) {}
 };
 
 /** TLS server authorization check config, wraps
diff --git a/src/core/ext/filters/client_channel/service_config.h b/src/core/ext/filters/client_channel/service_config.h
index f0206bf782e..9c13917e620 100644
--- a/src/core/ext/filters/client_channel/service_config.h
+++ b/src/core/ext/filters/client_channel/service_config.h
@@ -69,14 +69,14 @@ class ServiceConfig : public RefCounted<ServiceConfig> {
    public:
     virtual ~Parser() = default;
 
-    virtual UniquePtr<ParsedConfig> ParseGlobalParams(const grpc_json* json,
-                                                      grpc_error** error) {
+    virtual UniquePtr<ParsedConfig> ParseGlobalParams(
+        const grpc_json* /* json */, grpc_error** error) {
       GPR_DEBUG_ASSERT(error != nullptr);
       return nullptr;
     }
 
-    virtual UniquePtr<ParsedConfig> ParsePerMethodParams(const grpc_json* json,
-                                                         grpc_error** error) {
+    virtual UniquePtr<ParsedConfig> ParsePerMethodParams(
+        const grpc_json* /* json */, grpc_error** error) {
       GPR_DEBUG_ASSERT(error != nullptr);
       return nullptr;
     }
diff --git a/src/core/ext/transport/chttp2/transport/flow_control.h b/src/core/ext/transport/chttp2/transport/flow_control.h
index 39ce1c51ec9..76ef7a29530 100644
--- a/src/core/ext/transport/chttp2/transport/flow_control.h
+++ b/src/core/ext/transport/chttp2/transport/flow_control.h
@@ -152,7 +152,7 @@ class TransportFlowControlBase {
   virtual bool flow_control_enabled() const { abort(); }
 
   // Called to check if the transport needs to send a WINDOW_UPDATE frame
-  virtual uint32_t MaybeSendUpdate(bool writing_anyway) { abort(); }
+  virtual uint32_t MaybeSendUpdate(bool /* writing_anyway */) { abort(); }
 
   // Using the protected members, returns and Action to be taken by the
   // tranport.
@@ -165,14 +165,14 @@ class TransportFlowControlBase {
 
   // Called to do bookkeeping when a stream owned by this transport sends
   // data on the wire
-  virtual void StreamSentData(int64_t size) { abort(); }
+  virtual void StreamSentData(int64_t /* size */) { abort(); }
 
   // Called to do bookkeeping when a stream owned by this transport receives
   // data from the wire. Also does error checking for frame size.
-  virtual grpc_error* RecvData(int64_t incoming_frame_size) { abort(); }
+  virtual grpc_error* RecvData(int64_t /* incoming_frame_size */) { abort(); }
 
   // Called to do bookkeeping when we receive a WINDOW_UPDATE frame.
-  virtual void RecvUpdate(uint32_t size) { abort(); }
+  virtual void RecvUpdate(uint32_t /* size */) { abort(); }
 
   // Returns the BdpEstimator held by this object. Caller is responsible for
   // checking for nullptr. TODO(ncteisen): consider fully encapsulating all
@@ -207,14 +207,14 @@ class TransportFlowControlDisabled final : public TransportFlowControlBase {
   bool flow_control_enabled() const override { return false; }
 
   // Never do anything.
-  uint32_t MaybeSendUpdate(bool writing_anyway) override { return 0; }
+  uint32_t MaybeSendUpdate(bool /* writing_anyway */) override { return 0; }
   FlowControlAction MakeAction() override { return FlowControlAction(); }
   FlowControlAction PeriodicUpdate() override { return FlowControlAction(); }
-  void StreamSentData(int64_t size) override {}
-  grpc_error* RecvData(int64_t incoming_frame_size) override {
+  void StreamSentData(int64_t /* size */) override {}
+  grpc_error* RecvData(int64_t /* incoming_frame_size */) override {
     return GRPC_ERROR_NONE;
   }
-  void RecvUpdate(uint32_t size) override {}
+  void RecvUpdate(uint32_t /* size */) override {}
 };
 
 // Implementation of flow control that abides to HTTP/2 spec and attempts
@@ -347,29 +347,31 @@ class StreamFlowControlBase {
   virtual ~StreamFlowControlBase() {}
 
   // Updates an action using the protected members.
-  virtual FlowControlAction UpdateAction(FlowControlAction action) { abort(); }
+  virtual FlowControlAction UpdateAction(FlowControlAction /* action */) {
+    abort();
+  }
 
   // Using the protected members, returns an Action for this stream to be
   // taken by the tranport.
   virtual FlowControlAction MakeAction() { abort(); }
 
   // Bookkeeping for when data is sent on this stream.
-  virtual void SentData(int64_t outgoing_frame_size) { abort(); }
+  virtual void SentData(int64_t /* outgoing_frame_size */) { abort(); }
 
   // Bookkeeping and error checking for when data is received by this stream.
-  virtual grpc_error* RecvData(int64_t incoming_frame_size) { abort(); }
+  virtual grpc_error* RecvData(int64_t /* incoming_frame_size */) { abort(); }
 
   // Called to check if this stream needs to send a WINDOW_UPDATE frame.
   virtual uint32_t MaybeSendUpdate() { abort(); }
 
   // Bookkeeping for receiving a WINDOW_UPDATE from for this stream.
-  virtual void RecvUpdate(uint32_t size) { abort(); }
+  virtual void RecvUpdate(uint32_t /* size */) { abort(); }
 
   // Bookkeeping for when a call pulls bytes out of the transport. At this
   // point we consider the data 'used' and can thus let out peer know we are
   // ready for more data.
-  virtual void IncomingByteStreamUpdate(size_t max_size_hint,
-                                        size_t have_already) {
+  virtual void IncomingByteStreamUpdate(size_t /* max_size_hint */,
+                                        size_t /* have_already */) {
     abort();
   }
 
@@ -399,14 +401,14 @@ class StreamFlowControlDisabled : public StreamFlowControlBase {
     return action;
   }
   FlowControlAction MakeAction() override { return FlowControlAction(); }
-  void SentData(int64_t outgoing_frame_size) override {}
-  grpc_error* RecvData(int64_t incoming_frame_size) override {
+  void SentData(int64_t /* outgoing_frame_size */) override {}
+  grpc_error* RecvData(int64_t /* incoming_frame_size */) override {
     return GRPC_ERROR_NONE;
   }
   uint32_t MaybeSendUpdate() override { return 0; }
-  void RecvUpdate(uint32_t size) override {}
-  void IncomingByteStreamUpdate(size_t max_size_hint,
-                                size_t have_already) override {}
+  void RecvUpdate(uint32_t /* size */) override {}
+  void IncomingByteStreamUpdate(size_t /* max_size_hint */,
+                                size_t /* have_already */) override {}
 };
 
 // Implementation of flow control that abides to HTTP/2 spec and attempts
diff --git a/src/core/lib/gprpp/memory.h b/src/core/lib/gprpp/memory.h
index 68717dd019d..f0c6bb14658 100644
--- a/src/core/lib/gprpp/memory.h
+++ b/src/core/lib/gprpp/memory.h
@@ -110,7 +110,7 @@ class Allocator {
                    std::allocator<void>::const_pointer hint = nullptr) {
     return static_cast<pointer>(gpr_malloc(n * sizeof(T)));
   }
-  void deallocate(T* p, std::size_t n) { gpr_free(p); }
+  void deallocate(T* p, std::size_t /* n */) { gpr_free(p); }
   size_t max_size() const {
     return std::numeric_limits<size_type>::max() / sizeof(value_type);
   }
diff --git a/src/core/lib/iomgr/exec_ctx.h b/src/core/lib/iomgr/exec_ctx.h
index 0ccf2a878bf..f1907396e14 100644
--- a/src/core/lib/iomgr/exec_ctx.h
+++ b/src/core/lib/iomgr/exec_ctx.h
@@ -225,7 +225,7 @@ class ExecCtx {
   virtual bool CheckReadyToFinish() { return false; }
 
   /** Disallow delete on ExecCtx. */
-  static void operator delete(void* p) { abort(); }
+  static void operator delete(void* /* p */) { abort(); }
 
  private:
   /** Set exec_ctx_ to exec_ctx. */
diff --git a/src/core/lib/iomgr/udp_server.h b/src/core/lib/iomgr/udp_server.h
index 759917ee4e4..e92f3b994bd 100644
--- a/src/core/lib/iomgr/udp_server.h
+++ b/src/core/lib/iomgr/udp_server.h
@@ -38,7 +38,7 @@ typedef struct grpc_udp_server grpc_udp_server;
  * Its implementation should do the real IO work, e.g. read packet and write. */
 class GrpcUdpHandler {
  public:
-  GrpcUdpHandler(grpc_fd* emfd, void* user_data) {}
+  GrpcUdpHandler(grpc_fd* /* emfd */, void* /* user_data */) {}
   virtual ~GrpcUdpHandler() {}
 
   // Interfaces to be implemented by subclasses to do the actual setup/tear down
diff --git a/src/cpp/server/secure_server_credentials.cc b/src/cpp/server/secure_server_credentials.cc
index 623fb2c03d0..81b99913000 100644
--- a/src/cpp/server/secure_server_credentials.cc
+++ b/src/cpp/server/secure_server_credentials.cc
@@ -131,7 +131,7 @@ std::shared_ptr<ServerCredentials> SslServerCredentials(
 namespace experimental {
 
 std::shared_ptr<ServerCredentials> AltsServerCredentials(
-    const AltsServerCredentialsOptions& options) {
+    const AltsServerCredentialsOptions& /* options */) {
   grpc_alts_credentials_options* c_options =
       grpc_alts_credentials_server_options_create();
   grpc_server_credentials* c_creds =