Index: clang-tidy/google/NonConstReferences.h
===================================================================
--- clang-tidy/google/NonConstReferences.h
+++ clang-tidy/google/NonConstReferences.h
@@ -22,10 +22,13 @@
 /// https://google.github.io/styleguide/cppguide.html#Reference_Arguments
 class NonConstReferences : public ClangTidyCheck {
 public:
-  NonConstReferences(StringRef Name, ClangTidyContext *Context)
-      : ClangTidyCheck(Name, Context) {}
+  NonConstReferences(StringRef Name, ClangTidyContext *Context);
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+
+private:
+  const std::vector<std::string> WhiteListTypes;
 };
 
 } // namespace runtime
Index: clang-tidy/google/NonConstReferences.cpp
===================================================================
--- clang-tidy/google/NonConstReferences.cpp
+++ clang-tidy/google/NonConstReferences.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "NonConstReferences.h"
+#include "../utils/OptionsUtils.h"
 #include "clang/AST/DeclBase.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
@@ -19,7 +20,21 @@
 namespace google {
 namespace runtime {
 
+NonConstReferences::NonConstReferences(StringRef Name,
+                                       ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      WhiteListTypes(
+          utils::options::parseStringList(Options.get("WhiteListTypes", ""))) {}
+
+void NonConstReferences::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+   Options.store(Opts, "WhiteListTypes",
+                 utils::options::serializeStringList(WhiteListTypes));
+}
+
 void NonConstReferences::registerMatchers(MatchFinder *Finder) {
+  if (!getLangOpts().CPlusPlus)
+    return;
+
   Finder->addMatcher(
       parmVarDecl(
           unless(isInstantiated()),
@@ -52,6 +67,13 @@
   }
 
   auto ReferencedType = *Result.Nodes.getNodeAs<QualType>("referenced_type");
+
+  for (const auto &WhiteListType: WhiteListTypes) {
+    if (ReferencedType.getCanonicalType().getAsString(
+            Result.Context->getPrintingPolicy()) == WhiteListType)
+      return;
+  }
+
   // Don't warn on function references, they shouldn't be constant.
   if (ReferencedType->isFunctionProtoType())
     return;
Index: docs/clang-tidy/checks/google-runtime-references.rst
===================================================================
--- docs/clang-tidy/checks/google-runtime-references.rst
+++ docs/clang-tidy/checks/google-runtime-references.rst
@@ -7,3 +7,11 @@
 
 The corresponding style guide rule:
 https://google.github.io/styleguide/cppguide.html#Reference_Arguments
+
+
+Options
+-------
+
+.. option:: WhiteListTypes
+
+   A semicolon-separated list of names of whitelist types. Defualt is empty.
Index: test/clang-tidy/google-runtime-references.cpp
===================================================================
--- test/clang-tidy/google-runtime-references.cpp
+++ test/clang-tidy/google-runtime-references.cpp
@@ -1,4 +1,8 @@
-// RUN: %check_clang_tidy %s google-runtime-references %t
+// RUN: %check_clang_tidy %s google-runtime-references %t -- \
+// RUN:   -extra-arg="-std=c++11" \
+// RUN:   -config="{CheckOptions: \
+// RUN:             [{key: google-runtime-references.WhiteListTypes, \
+// RUN:               value: 'whitelist::A; whitelist::B'}]}" --
 
 int a;
 int &b = a;
@@ -137,3 +141,12 @@
 A& operator|=(A& a, const A& b) { return a; }
 A& operator^=(A& a, const A& b) { return a; }
 A& operator&=(A& a, const A& b) { return a; }
+
+namespace whitelist {
+class A {};
+class B {};
+void f7(A &);
+void f8(B &);
+}
+void f9(whitelist::A &);
+void f10(whitelist::B &);