Index: include/clang/Sema/CodeCompleteConsumer.h
===================================================================
--- include/clang/Sema/CodeCompleteConsumer.h
+++ include/clang/Sema/CodeCompleteConsumer.h
@@ -946,6 +946,11 @@
                                      CodeCompletionAllocator &Allocator,
                                      CodeCompletionTUInfo &CCTUInfo);
 
+  CodeCompletionString *createCodeCompletionStringForDecl(
+      Preprocessor &PP, ASTContext &Ctx, CodeCompletionBuilder &Result,
+      bool IncludeBriefComments, const CodeCompletionContext &CCContext,
+      PrintingPolicy &Policy);
+
   /// Retrieve the name that should be used to order a result.
   ///
   /// If the name needs to be constructed as a string, that string will be
Index: lib/Sema/SemaCodeComplete.cpp
===================================================================
--- lib/Sema/SemaCodeComplete.cpp
+++ lib/Sema/SemaCodeComplete.cpp
@@ -1598,6 +1598,78 @@
   Results.AddResult(CodeCompletionResult(Builder.TakeString()));
 }
 
+namespace {
+void printOverrideString(llvm::raw_ostream &OS, CodeCompletionString *CCS) {
+  for (const auto &C : *CCS) {
+    if (C.Kind == CodeCompletionString::CK_Optional)
+      printOverrideString(OS, C.Optional);
+    else
+      OS << C.Text;
+    // Add a space after return type.
+    if (C.Kind == CodeCompletionString::CK_ResultType)
+      OS << ' ';
+  }
+}
+} // namespace
+
+static void AddOverrideResults(ResultBuilder &Results,
+                               const CodeCompletionContext &CCContext,
+                               CodeCompletionBuilder &Builder) {
+  Sema &S = Results.getSema();
+  const auto *CR = llvm::dyn_cast<CXXRecordDecl>(S.CurContext);
+  // If not inside a class/struct/union return empty.
+  if (!CR)
+    return;
+  // First store overrides within current class.
+  // These are stored by name to make querying fast in the later step.
+  llvm::StringMap<std::vector<FunctionDecl *>> Overrides;
+  for (auto *Method : CR->methods()) {
+    if (!Method->isVirtual() || !Method->getIdentifier())
+      continue;
+    Overrides[Method->getName()].push_back(Method);
+  }
+
+  for (const auto &Base : CR->bases()) {
+    const auto *BR = Base.getType().getTypePtr()->getAsCXXRecordDecl();
+    if (!BR)
+      continue;
+    for (auto *Method : BR->methods()) {
+      if (!Method->isVirtual() || !Method->getIdentifier())
+        continue;
+      const auto it = Overrides.find(Method->getName());
+      bool IsOverriden = false;
+      if (it != Overrides.end()) {
+        for (auto *MD : it->second) {
+          // If the method in current body is not an overload of this virtual
+          // function, then it overrides this one.
+          if (!S.IsOverload(MD, Method, false)) {
+            IsOverriden = true;
+            break;
+          }
+        }
+      }
+      if (!IsOverriden) {
+        // Generates a new CodeCompletionResult by taking this function and
+        // converting it into an override declaration with only one chunk in the
+        // final CodeCompletionString as a TypedTextChunk.
+        std::string OverrideSignature;
+        llvm::raw_string_ostream OS(OverrideSignature);
+        CodeCompletionResult CCR(Method, 0);
+        PrintingPolicy Policy =
+            getCompletionPrintingPolicy(S.getASTContext(), S.getPreprocessor());
+        auto *CCS = CCR.createCodeCompletionStringForDecl(
+            S.getPreprocessor(), S.getASTContext(), Builder,
+            /*IncludeBriefComments=*/false, CCContext, Policy);
+        printOverrideString(OS, CCS);
+        OS << " override";
+        Builder.AddTypedTextChunk(Builder.getAllocator().CopyString(OS.str()));
+        Results.AddResult(CodeCompletionResult(Builder.TakeString(), Method,
+                                               CCP_CodePattern));
+      }
+    }
+  }
+}
+
 /// Add language constructs that show up for "ordinary" names.
 static void AddOrdinaryNameResults(Sema::ParserCompletionContext CCC,
                                    Scope *S,
@@ -1706,6 +1778,9 @@
         if (IsNotInheritanceScope && Results.includeCodePatterns())
           Builder.AddChunk(CodeCompletionString::CK_Colon);
         Results.AddResult(Result(Builder.TakeString()));
+
+        AddOverrideResults(Results, CodeCompletionContext::CCC_ClassStructUnion,
+                           Builder);
       }
     }
     LLVM_FALLTHROUGH;
@@ -2834,6 +2909,14 @@
     return Result.TakeString();
   }
   assert(Kind == RK_Declaration && "Missed a result kind?");
+  return createCodeCompletionStringForDecl(PP, Ctx, Result, IncludeBriefComments,
+                                    CCContext, Policy);
+}
+
+CodeCompletionString *CodeCompletionResult::createCodeCompletionStringForDecl(
+    Preprocessor &PP, ASTContext &Ctx, CodeCompletionBuilder &Result,
+    bool IncludeBriefComments, const CodeCompletionContext &CCContext,
+    PrintingPolicy &Policy) {
   const NamedDecl *ND = Declaration;
   Result.addParentContext(ND->getDeclContext());
 
@@ -2931,7 +3014,6 @@
     Result.AddChunk(CodeCompletionString::CK_RightAngle);
     return Result.TakeString();
   }
-
   if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(ND)) {
     Selector Sel = Method->getSelector();
     if (Sel.isUnarySelector()) {
@@ -3027,7 +3109,7 @@
                                    Ctx, Policy);
 
   Result.AddTypedTextChunk(
-                       Result.getAllocator().CopyString(ND->getNameAsString()));
+      Result.getAllocator().CopyString(ND->getNameAsString()));
   return Result.TakeString();
 }
 
Index: test/CodeCompletion/overrides.cpp
===================================================================
--- /dev/null
+++ test/CodeCompletion/overrides.cpp
@@ -0,0 +1,33 @@
+class A {
+ public:
+  virtual void vfunc(bool param);
+  virtual void vfunc(bool param, int p);
+  void func(bool param);
+};
+class B : public A {
+virtual int ttt(bool param, int x = 3) const;
+void vfunc(bool param, int p) override;
+};
+class C : public B {
+ public:
+  void vfunc(bool param) override;
+  void
+};
+
+// Runs completion at ^void.
+// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:14:3 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+// CHECK-CC1: COMPLETION: Pattern : int ttt(bool param, int x = 3) const override{{$}}
+// CHECK-CC1: COMPLETION: Pattern : void vfunc(bool param, int p) override{{$}}
+// CHECK-CC1-NOT: COMPLETION: Pattern : void vfunc(bool param) override{{$}}
+//
+// Runs completion at vo^id.
+// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:14:5 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
+// CHECK-CC2: COMPLETION: Pattern : void vfunc(bool param, int p) override{{$}}
+// CHECK-CC2-NOT: COMPLETION: Pattern : int ttt(bool param, int x = 3) const override{{$}}
+// CHECK-CC2-NOT: COMPLETION: Pattern : void vfunc(bool param) override{{$}}
+//
+// Runs completion at void ^.
+// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:14:8 %s -o - | FileCheck -check-prefix=CHECK-CC3 %s
+// CHECK-CC3-NOT: COMPLETION: Pattern : int ttt(bool param, int x = 3) const override{{$}}
+// CHECK-CC3-NOT: COMPLETION: Pattern : void vfunc(bool param, int p) override{{$}}
+// CHECK-CC3-NOT: COMPLETION: Pattern : void vfunc(bool param) override{{$}}