Index: clang-tidy/readability/CMakeLists.txt
===================================================================
--- clang-tidy/readability/CMakeLists.txt
+++ clang-tidy/readability/CMakeLists.txt
@@ -16,6 +16,7 @@
   NonConstParameterCheck.cpp
   ReadabilityTidyModule.cpp
   RedundantControlFlowCheck.cpp
+  RedundantMemberInitCheck.cpp
   RedundantStringCStrCheck.cpp
   RedundantSmartptrGetCheck.cpp
   RedundantStringInitCheck.cpp
Index: clang-tidy/readability/ReadabilityTidyModule.cpp
===================================================================
--- clang-tidy/readability/ReadabilityTidyModule.cpp
+++ clang-tidy/readability/ReadabilityTidyModule.cpp
@@ -23,6 +23,7 @@
 #include "NamedParameterCheck.h"
 #include "NonConstParameterCheck.h"
 #include "RedundantControlFlowCheck.h"
+#include "RedundantMemberInitCheck.h"
 #include "RedundantSmartptrGetCheck.h"
 #include "RedundantStringCStrCheck.h"
 #include "RedundantStringInitCheck.h"
@@ -57,6 +58,8 @@
         "readability-inconsistent-declaration-parameter-name");
     CheckFactories.registerCheck<MisplacedArrayIndexCheck>(
         "readability-misplaced-array-index");
+    CheckFactories.registerCheck<RedundantMemberInitCheck>(
+        "readability-redundant-member-init");
     CheckFactories.registerCheck<StaticDefinitionInAnonymousNamespaceCheck>(
         "readability-static-definition-in-anonymous-namespace");
     CheckFactories.registerCheck<readability::NamedParameterCheck>(
Index: clang-tidy/readability/RedundantMemberInitCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/readability/RedundantMemberInitCheck.h
@@ -0,0 +1,36 @@
+//===--- RedundantMemberInitCheck.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_READABILITY_REDUNDANT_MEMBER_INIT_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_REDUNDANT_MEMBER_INIT_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+/// Finds member initializations that are unnecessary because the same default
+/// constructor would be called if they were not present.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/readability-redundant-member-init.html
+class RedundantMemberInitCheck : public ClangTidyCheck {
+public:
+  RedundantMemberInitCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_REDUNDANT_MEMBER_INIT_H
Index: clang-tidy/readability/RedundantMemberInitCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/readability/RedundantMemberInitCheck.cpp
@@ -0,0 +1,49 @@
+//===--- RedundantMemberInitCheck.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 "RedundantMemberInitCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+#include <algorithm>
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+void RedundantMemberInitCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(
+      cxxConstructorDecl(
+          ofClass(unless(
+              anyOf(isUnion(), ast_matchers::isTemplateInstantiation()))),
+          forEachConstructorInitializer(
+              cxxCtorInitializer(
+                  isWritten(),
+                  withInitializer(cxxConstructExpr().bind("construct")))
+                  .bind("init"))),
+      this);
+}
+
+void RedundantMemberInitCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *Init = Result.Nodes.getNodeAs<CXXCtorInitializer>("init");
+  const auto *Construct = Result.Nodes.getNodeAs<CXXConstructExpr>("construct");
+
+  if (Construct->getNumArgs() == 0 ||
+      Construct->getArg(0)->isDefaultArgument()) {
+    diag(Init->getSourceLocation(), "initializer for %0 is redundant")
+        << Init->getMember()
+        << FixItHint::CreateRemoval(Init->getSourceRange());
+  }
+}
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -111,6 +111,12 @@
   Flags function parameters of a pointer type that could be changed to point to
   a constant type instead.
 
+- New `readability-redundant-member-init
+  <http://clang.llvm.org/extra/clang-tidy/checks/readability-redundant-member-init.html>`_ check
+
+  Flags member initializations that are unnecessary because the same default
+  constructor would be called if they were not present.
+
 Fixed bugs:
 
 - `modernize-make-unique
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -133,6 +133,7 @@
    readability-named-parameter
    readability-non-const-parameter
    readability-redundant-control-flow
+   readability-redundant-member-init
    readability-redundant-smartptr-get
    readability-redundant-string-cstr
    readability-redundant-string-init
Index: docs/clang-tidy/checks/readability-redundant-member-init.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/readability-redundant-member-init.rst
@@ -0,0 +1,20 @@
+.. title:: clang-tidy - readability-redundant-member-init
+
+readability-redundant-member-init
+=================================
+
+Finds member initializations that are unnecessary because the same default
+constructor would be called if they were not present.
+                                                                                                                        
+Example:                                                                                                               
+                                                                                                                        
+.. code-block:: c++                                                                                                     
+                                                                                                                        
+  // Explicitly initializing the member s is unnecessary.                                                      
+  class Foo {
+  public:
+    Foo() : s() {}
+
+  private:
+    std::string s;
+  };
Index: test/clang-tidy/readability-redundant-member-init.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/readability-redundant-member-init.cpp
@@ -0,0 +1,113 @@
+// RUN: %check_clang_tidy %s readability-redundant-member-init %t
+
+struct S {
+  S() = default;
+  S(int i) : i(i) {}
+  int i = 1;
+};
+
+struct T {
+  T(int i = 1) : i(i) {}
+  int i;
+};
+
+struct U {
+  int i;
+};
+
+// Initializer calls default constructor
+struct F1 {
+  F1() : f() {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: initializer for 'f' is redundant [readability-redundant-member-init]
+  // CHECK-FIXES:  F1()  {}
+  S f;
+};
+
+// Initializer calls default constructor with default argument
+struct F2 {
+  F2() : f() {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: initializer for 'f' is redundant [readability-redundant-member-init]
+  // CHECK-FIXES:  F2()  {}
+  T f;
+};
+
+// Multiple redundant initializers for same constructor
+struct F3 {
+  F3() : f(), g(1), h() {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: initializer for 'f' is redundant [readability-redundant-member-init]
+  // CHECK-MESSAGES: :[[@LINE-2]]:21: warning: initializer for 'h' is redundant [readability-redundant-member-init]
+  // CHECK-FIXES:  F3() : g(1) {}
+  S f, g, h;
+};
+
+// Templated class
+template <class V>
+struct F4 {
+  F4() : f(), g() {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: initializer for 'f' is redundant [readability-redundant-member-init]
+  // CHECK-FIXES:  F4() : g() {}
+  S f;
+  V g;
+};
+F4<int> f4i;
+F4<S> f4s;
+
+// Initializer not written
+struct NF1 {
+  NF1() {}
+  S f;
+};
+
+// Initializer doesn't call default constructor
+struct NF2 {
+  NF2() : f(1) {}
+  S f;
+};
+
+// Initializer calls default constructor without using default argument
+struct NF3 {
+  NF3() : f(1) {}
+  T f;
+};
+
+// Initializer calls default constructor without using default argument
+struct NF4 {
+  NF4() : f(2) {}
+  T f;
+};
+
+// Initializer is zero-initialization
+struct NF5 {
+  NF5() : i() {}
+  int i;
+};
+
+// Initializer is direct-initialization
+struct NF6 {
+  NF6() : i(1) {}
+  int i;
+};
+
+// Initializer is aggregate initialization of struct
+struct NF7 {
+  NF7() : f{} {}
+  U f;
+};
+
+// Initializer is aggregate initialization of array
+struct NF8 {
+  NF8() : f{} {}
+  int f[2];
+};
+
+struct NF9 {
+  NF9() : f{} {}
+  S f[2];
+};
+
+// Initializing member of union
+union NF10 {
+  NF10() : s() {}
+  int i;
+  S s;
+};