diff --git a/include/complex b/include/complex
index e1d72f4d..2943da1d 100644
--- a/include/complex
+++ b/include/complex
@@ -1521,6 +1521,47 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
     return __os << __s.str();
 }
 
+#if _LIBCPP_STD_VER > 11 
+// Literal suffix for complex number literals [complex.literals]
+inline namespace literals
+{ 
+  inline namespace complex_literals
+  {
+    constexpr complex<long double> operator""il(long double __im)
+    {
+        return { 0.0l, __im };
+    }
+
+    constexpr complex<long double> operator""il(unsigned long long __im)
+    {
+        return { 0.0l, static_cast<long double>(__im) };
+    }
+
+
+    constexpr complex<double> operator""i(long double __im)
+    {
+        return { 0.0, static_cast<double>(__im) };
+    }
+
+    constexpr complex<double> operator""i(unsigned long long __im)
+    {
+        return { 0.0, static_cast<double>(__im) };
+    }
+
+
+    constexpr complex<float> operator""if(long double __im)
+    {
+        return { 0.0f, static_cast<float>(__im) };
+    }
+
+    constexpr complex<float> operator""if(unsigned long long __im)
+    {
+        return { 0.0f, static_cast<float>(__im) };
+    }
+  }
+}
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_COMPLEX
diff --git a/test/numerics/complex.number/complex.literals/literals.pass.cpp b/test/numerics/complex.number/complex.literals/literals.pass.cpp
new file mode 100644
index 00000000..45b59914
--- /dev/null
+++ b/test/numerics/complex.number/complex.literals/literals.pass.cpp
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+#include <complex>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11 
+    using namespace std::literals::complex_literals;
+
+//  Make sure the types are right
+    static_assert ( std::is_same<decltype( 3.0il ), std::complex<long double>>::value, "" );
+    static_assert ( std::is_same<decltype( 3il   ), std::complex<long double>>::value, "" );
+    static_assert ( std::is_same<decltype( 3.0i  ), std::complex<double>>::value, "" );
+    static_assert ( std::is_same<decltype( 3i    ), std::complex<double>>::value, "" );
+    static_assert ( std::is_same<decltype( 3.0if ), std::complex<float>>::value, "" );
+    static_assert ( std::is_same<decltype( 3if   ), std::complex<float>>::value, "" );
+    
+    {
+    std::complex<long double> c1 = 3.0il;
+    assert ( c1 == std::complex<long double>(0, 3.0));
+    auto c2 = 3il;
+    assert ( c1 == c2 );
+    }
+    
+    {
+    std::complex<double> c1 = 3.0i;
+    assert ( c1 == std::complex<double>(0, 3.0));
+    auto c2 = 3i;
+    assert ( c1 == c2 );
+    }
+
+    {
+    std::complex<float> c1 = 3.0if;
+    assert ( c1 == std::complex<float>(0, 3.0));
+    auto c2 = 3if;
+    assert ( c1 == c2 );
+    }
+
+#endif
+}
diff --git a/test/numerics/complex.number/complex.literals/literals1.fail.cpp b/test/numerics/complex.number/complex.literals/literals1.fail.cpp
new file mode 100644
index 00000000..0f31d595
--- /dev/null
+++ b/test/numerics/complex.number/complex.literals/literals1.fail.cpp
@@ -0,0 +1,20 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include <complex>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11 
+    std::complex<float> foo  = 1.0if;  // should fail w/conversion operator not found
+#else
+#error
+#endif
+}
diff --git a/test/numerics/complex.number/complex.literals/literals1.pass.cpp b/test/numerics/complex.number/complex.literals/literals1.pass.cpp
new file mode 100644
index 00000000..46903bbd
--- /dev/null
+++ b/test/numerics/complex.number/complex.literals/literals1.pass.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+#include <complex>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11 
+    using namespace std::literals;
+
+    {
+    std::complex<long double> c1 = 3.0il;
+    assert ( c1 == std::complex<long double>(0, 3.0));
+    auto c2 = 3il;
+    assert ( c1 == c2 );
+    }
+    
+    {
+    std::complex<double> c1 = 3.0i;
+    assert ( c1 == std::complex<double>(0, 3.0));
+    auto c2 = 3i;
+    assert ( c1 == c2 );
+    }
+
+    {
+    std::complex<float> c1 = 3.0if;
+    assert ( c1 == std::complex<float>(0, 3.0));
+    auto c2 = 3if;
+    assert ( c1 == c2 );
+    }
+
+#endif
+}
diff --git a/test/numerics/complex.number/complex.literals/literals2.pass.cpp b/test/numerics/complex.number/complex.literals/literals2.pass.cpp
new file mode 100644
index 00000000..8bd8acd9
--- /dev/null
+++ b/test/numerics/complex.number/complex.literals/literals2.pass.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+#include <complex>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11 
+    using namespace std;
+
+    {
+    std::complex<long double> c1 = 3.0il;
+    assert ( c1 == std::complex<long double>(0, 3.0));
+    auto c2 = 3il;
+    assert ( c1 == c2 );
+    }
+    
+    {
+    std::complex<double> c1 = 3.0i;
+    assert ( c1 == std::complex<double>(0, 3.0));
+    auto c2 = 3i;
+    assert ( c1 == c2 );
+    }
+
+    {
+    std::complex<float> c1 = 3.0if;
+    assert ( c1 == std::complex<float>(0, 3.0));
+    auto c2 = 3if;
+    assert ( c1 == c2 );
+    }
+
+#endif
+}