Index: clang-tidy/misc/CMakeLists.txt
===================================================================
--- clang-tidy/misc/CMakeLists.txt
+++ clang-tidy/misc/CMakeLists.txt
@@ -7,6 +7,7 @@
   InaccurateEraseCheck.cpp
   InefficientAlgorithmCheck.cpp
   MiscTidyModule.cpp
+  MissingNamespaceStdCheck.cpp
   SwappedArgumentsCheck.cpp
   UndelegatedConstructor.cpp
   UnusedRAII.cpp
Index: clang-tidy/misc/MiscTidyModule.cpp
===================================================================
--- clang-tidy/misc/MiscTidyModule.cpp
+++ clang-tidy/misc/MiscTidyModule.cpp
@@ -13,6 +13,7 @@
 #include "ArgumentCommentCheck.h"
 #include "AssignOperatorSignatureCheck.h"
 #include "BoolPointerImplicitConversion.h"
+#include "MissingNamespaceStdCheck.h"
 #include "InaccurateEraseCheck.h"
 #include "InefficientAlgorithmCheck.h"
 #include "SwappedArgumentsCheck.h"
@@ -44,6 +45,7 @@
         "misc-uniqueptr-reset-release");
     CheckFactories.registerCheck<UnusedRAIICheck>("misc-unused-raii");
     CheckFactories.registerCheck<UseOverride>("misc-use-override");
+    CheckFactories.registerCheck<MissingNamespaceStdCheck>("misc-missing-namespace-std");
   }
 };
 
Index: clang-tidy/misc/MissingNamespaceStdCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/misc/MissingNamespaceStdCheck.h
@@ -0,0 +1,30 @@
+//===--- MissingNamespaceStdCheck.h - clang-tidy---------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_ADD_NAMESPACE_STD_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_ADD_NAMESPACE_STD_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+
+class MissingNamespaceStdCheck : public ClangTidyCheck {
+public:
+  MissingNamespaceStdCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_ADD_NAMESPACE_STD_H
+
Index: clang-tidy/misc/MissingNamespaceStdCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/misc/MissingNamespaceStdCheck.cpp
@@ -0,0 +1,61 @@
+//===--- MissingNamespaceStdCheck.cpp - clang-tidy-----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MissingNamespaceStdCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+
+void MissingNamespaceStdCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(decl(anyOf(fieldDecl(),varDecl())).bind("field_or_variable"), this);
+}
+
+StringRef getTypeNameSource(const DeclaratorDecl& decl, const SourceManager& SM, const ASTContext& Context)
+{
+  UnqualTypeLoc UnqualifiedTypeLocation = decl.getTypeSourceInfo()->getTypeLoc().getUnqualifiedLoc();
+  SourceRange TokRange(UnqualifiedTypeLocation.getLocStart(), UnqualifiedTypeLocation.getLocEnd());
+  return Lexer::getSourceText(CharSourceRange::getTokenRange(TokRange), SM, Context.getLangOpts());
+}
+
+void MissingNamespaceStdCheck::check(const MatchFinder::MatchResult &Result) {
+                                                           
+  const DeclaratorDecl *MatchedDecl = Result.Nodes.getNodeAs<DeclaratorDecl>("field_or_variable");
+
+  auto MatchedType = MatchedDecl->getType().getTypePtr();
+  if (!MatchedType->isStructureOrClassType())
+    return;
+
+  const RecordType* recordType = static_cast<const RecordType *>(MatchedType);
+  const RecordDecl* recordDecl = recordType->getAsCXXRecordDecl();
+  const DeclContext* recordContext = recordDecl->getDeclContext();
+  if (!recordContext->isStdNamespace())
+    return;
+
+  // Check to see that type actually is missing namespace std
+  StringRef typeNameSource = getTypeNameSource(*MatchedDecl, *Result.SourceManager, *Result.Context);
+  if (typeNameSource.startswith("::std") || typeNameSource.startswith("std"))
+    return;
+
+  auto FieldTypeName = MatchedDecl->getType().getUnqualifiedType().getAsString();
+  diag(MatchedDecl->getTypeSourceInfo()->getTypeLoc().getLocStart(),
+       "type '%0' is missing namespace std")
+      << FieldTypeName
+      << FixItHint::CreateInsertion(
+             MatchedDecl->getTypeSourceInfo()->getTypeLoc().getLocStart(),
+             "std::");
+}
+
+} // namespace tidy
+} // namespace clang
+
Index: test/clang-tidy/misc-missing-namespace-std.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/misc-missing-namespace-std.cpp
@@ -0,0 +1,12 @@
+// RUN: $(dirname %s)/check_clang_tidy.sh %s misc-missing-namespace-std %t
+// REQUIRES: shell
+
+namespace std { struct Demo{}; }
+
+using namespace std;
+
+Demo global_demo_instance;
+// CHECK: warning: type 'Demo' is missing namespace std.
+// CHECK-FIXES:  std::Demo global_demo_instance;
+
+std::Demo global_demo_instance_with_std; // no-warning