Index: clang-tidy/google/UsingNamespaceDirectiveCheck.h
===================================================================
--- clang-tidy/google/UsingNamespaceDirectiveCheck.h
+++ clang-tidy/google/UsingNamespaceDirectiveCheck.h
@@ -11,6 +11,7 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_USINGNAMESPACEDIRECTIVECHECK_H
 
 #include "../ClangTidy.h"
+#include "llvm/Support/Regex.h"
 
 namespace clang {
 namespace tidy {
@@ -34,10 +35,13 @@
 /// Corresponding cpplint.py check name: `build/namespaces`.
 class UsingNamespaceDirectiveCheck : public ClangTidyCheck {
 public:
-  UsingNamespaceDirectiveCheck(StringRef Name, ClangTidyContext *Context)
-      : ClangTidyCheck(Name, Context) {}
+  UsingNamespaceDirectiveCheck(StringRef Name, ClangTidyContext *Context);
+
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+  llvm::Regex StandardLiteralsNamespaceRE;
 };
 
 } // namespace build
Index: clang-tidy/google/UsingNamespaceDirectiveCheck.cpp
===================================================================
--- clang-tidy/google/UsingNamespaceDirectiveCheck.cpp
+++ clang-tidy/google/UsingNamespaceDirectiveCheck.cpp
@@ -19,6 +19,11 @@
 namespace google {
 namespace build {
 
+UsingNamespaceDirectiveCheck::UsingNamespaceDirectiveCheck(
+    StringRef Name, ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      StandardLiteralsNamespaceRE("^std::.*literals$") {}
+
 void UsingNamespaceDirectiveCheck::registerMatchers(
     ast_matchers::MatchFinder *Finder) {
   // Only register the matchers for C++; the functionality currently does not
@@ -34,6 +39,13 @@
   if (U->isImplicit() || !Loc.isValid())
     return;
 
+  if (StandardLiteralsNamespaceRE.match(
+          U->getNominatedNamespace()->getQualifiedNameAsString())) {
+    // Do not warn if name matches std::.*literals. User-defined literals in
+    // standard library can only be used with a using directive.
+    return;
+  }
+
   diag(Loc, "do not use namespace using-directives; "
             "use using-declarations instead");
   // TODO: We could suggest a list of using directives replacing the using
Index: test/clang-tidy/google-namespaces.cpp
===================================================================
--- test/clang-tidy/google-namespaces.cpp
+++ test/clang-tidy/google-namespaces.cpp
@@ -6,3 +6,31 @@
 // CHECK: :[[@LINE-1]]:1: warning: do not use namespace using-directives; use using-declarations instead [google-build-using-namespace]
 
 using spaaaace::core; // no-warning
+
+namespace std {
+inline namespace literals {
+inline namespace chrono_literals {
+}
+inline namespace complex_literals {
+}
+inline namespace string_literals {
+}
+}
+}
+
+using namespace std::chrono_literals;            // no-warning
+using namespace std::complex_literals;           // no-warning
+using namespace std::literals;                   // no-warning
+using namespace std::literals::chrono_literals;  // no-warning
+using namespace std::literals::complex_literals; // no-warning
+using namespace std::literals::string_literals;  // no-warning
+using namespace std::string_literals;            // no-warning
+
+namespace literals {}
+namespace foo::literals {}
+
+using namespace literals;
+// CHECK: :[[@LINE-1]]:1: warning: do not use namespace using-directives; Use using-declarations instead [google-build-using-namespace]
+
+using namespace foo::literals;
+// CHECK: :[[@LINE-1]]:1: warning: do not use namespace using-directives; Use using-declarations instead [google-build-using-namespace]