diff --git a/pkgs/development/libraries/haskell/diff3/default.nix b/pkgs/development/libraries/haskell/diff3/default.nix
new file mode 100644
index 000000000000..60f27e89d58f
--- /dev/null
+++ b/pkgs/development/libraries/haskell/diff3/default.nix
@@ -0,0 +1,19 @@
+{ cabal, Diff, QuickCheck, testFramework, testFrameworkQuickcheck2
+}:
+
+cabal.mkDerivation (self: {
+  pname = "diff3";
+  version = "0.2.0.3";
+  sha256 = "0zdfn1jhsq8pd23qpkhzr8wgiwbazfbq688bjnpc406i7gq88k78";
+  buildDepends = [ Diff ];
+  testDepends = [
+    QuickCheck testFramework testFrameworkQuickcheck2
+  ];
+  meta = {
+    homepage = "http://github.com/ocharles/diff3.git";
+    description = "Perform a 3-way difference of documents";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.ocharles ];
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index a599b48f0650..0d457bbbb513 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -944,6 +944,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   Diff = callPackage ../development/libraries/haskell/Diff {};
 
+  diff3 = callPackage ../development/libraries/haskell/diff3 {};
+
   digest = callPackage ../development/libraries/haskell/digest {
     inherit (pkgs) zlib;
   };