diff --git a/pkgs/development/libraries/x265/default.nix b/pkgs/development/libraries/x265/default.nix
new file mode 100644
index 00000000000..b9be7a55c79
--- /dev/null
+++ b/pkgs/development/libraries/x265/default.nix
@@ -0,0 +1,52 @@
+{ stdenv, cmake, fetchurl, yasm
+, highBitDepth ? false
+, debuggingSupport ? false
+, enableCli ? true
+, testSupport ? false
+}:
+
+stdenv.mkDerivation rec {
+  version = "1.3";
+  name = "x265-${version}";
+
+  src = fetchurl {
+    url = "mirror://gentoo/distfiles/${name}.tar.bz2";
+    sha256 = "3807090a99bc351894d58eb037db4f1487b2dba3489eb2c38ab43dd6b7c9b09d";
+  };
+
+  cmakeFlags = with stdenv.lib;
+    ''
+      ${if debuggingSupport
+        then "-DCHECKED_BUILD=ON"
+        else "-DCHECKED_BUILD=OFF"
+      }
+      -DSTATIC_LINK_CRT=OFF
+      ${if (stdenv.system == "x86_64-linux" && highBitDepth)
+        then "-DHIGH_BIT_DEPTH=ON"
+        else "-DHIGH_BIT_DEPTH=OFF"
+      }
+      -DWARNINGS_AS_ERRORS=OFF
+      -DENABLE_PPA=OFF
+      -DENABLE_SHARED=ON
+      ${if enableCli
+        then "-DENABLE_CLI=ON"
+        else "-DENABLE_CLI=OFF"
+      }
+      ${if testSupport
+        then "-DENABLE_TESTS=ON"
+        else "-DENABLE_TESTS=OFF"
+      }
+    '';
+
+  preConfigure = "cd source";
+
+  buildInputs = [ cmake yasm ];
+
+  meta = with stdenv.lib; {
+    homepage = "http://x265.org";
+    description = "Library for encoding h.265/HEVC video streams";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ codyopel ];
+  };
+}
\ No newline at end of file
diff --git a/pkgs/development/libraries/x265/hg.nix b/pkgs/development/libraries/x265/hg.nix
new file mode 100644
index 00000000000..d615acebc01
--- /dev/null
+++ b/pkgs/development/libraries/x265/hg.nix
@@ -0,0 +1,52 @@
+{ stdenv, cmake, fetchhg, yasm
+, highBitDepth ? false
+, debuggingSupport ? false
+, enableCli ? true
+, testSupport ? false
+}:
+
+stdenv.mkDerivation rec {
+  name = "x265-hg";
+
+  src = fetchhg {
+    url = "https://bitbucket.org/multicoreware/x265/src";
+    rev = "eebb372eec893efc50e66806fcc19b1c1bd89683";
+    sha256 = "03dpbjqcmbmyid45560byabybfzy2bvic0gqa6k6hxci6rvmynpi";
+  };
+
+  cmakeFlags = with stdenv.lib;
+    ''
+      ${if debuggingSupport
+        then "-DCHECKED_BUILD=ON"
+        else "-DCHECKED_BUILD=OFF"
+      }
+      -DSTATIC_LINK_CRT=OFF
+      ${if (stdenv.system == "x86_64-linux" && highBitDepth)
+        then "-DHIGH_BIT_DEPTH=ON"
+        else "-DHIGH_BIT_DEPTH=OFF"
+      }
+      -DWARNINGS_AS_ERRORS=OFF
+      -DENABLE_PPA=OFF
+      -DENABLE_SHARED=ON
+      ${if enableCli
+        then "-DENABLE_CLI=ON"
+        else "-DENABLE_CLI=OFF"
+      }
+      ${if testSupport
+        then "-DENABLE_TESTS=ON"
+        else "-DENABLE_TESTS=OFF"
+      }
+    '';
+
+  preConfigure = "cd source";
+
+  buildInputs = [ cmake yasm ];
+
+  meta = with stdenv.lib; {
+    homepage = "http://x265.org";
+    description = "Library for encoding h.265/HEVC video streams";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ codyopel ];
+  };
+}
\ No newline at end of file
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c8a99ce8954..bd019a5876c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6946,6 +6946,10 @@ let
 
   x264 = callPackage ../development/libraries/x264 { };
 
+  x265 = callPackage ../development/libraries/x265 { };
+
+  x265-hg = callPackage ../development/libraries/x265/hg.nix { };
+
   xapian = callPackage ../development/libraries/xapian { };
 
   xapianBindings = callPackage ../development/libraries/xapian/bindings {  # TODO perl php Java, tcl, C#, python