diff --git a/pkgs/by-name/ut/ut1999/package.nix b/pkgs/by-name/ut/ut1999/package.nix
index 0d98b412e867..dcb9058ac002 100644
--- a/pkgs/by-name/ut/ut1999/package.nix
+++ b/pkgs/by-name/ut/ut1999/package.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, requireFile, autoPatchelfHook, fetchurl, makeDesktopItem, copyDesktopItems, imagemagick
+{ lib, stdenv, requireFile, autoPatchelfHook, undmg, fetchurl, makeDesktopItem, copyDesktopItems, imagemagick
 , runCommand, libgcc, wxGTK32, innoextract, libGL, SDL2, openal, libmpg123, libxmp }:
 
 let
@@ -12,6 +12,10 @@ let
       url = "https://github.com/OldUnreal/UnrealTournamentPatches/releases/download/v${version}/OldUnreal-UTPatch${version}-Linux-x86.tar.bz2";
       hash = "sha256-1JsFKuAAj/LtYvOUPFu0Hn+zvY3riW0YlJbLd4UnaKU=";
     };
+    x86_64-darwin = fetchurl {
+      url = "https://github.com/OldUnreal/UnrealTournamentPatches/releases/download/v${version}/OldUnreal-UTPatch${version}-macOS-Sonoma.dmg";
+      hash = "sha256-TbhJbOH4E5WOb6XR9dmqLkXziK3/CzhNjd1ypBkkmvw=";
+    };
   };
   unpackGog = runCommand "ut1999-gog" {
     src = requireFile rec {
@@ -35,6 +39,7 @@ let
   systemDir = {
     x86_64-linux = "System64";
     i686-linux = "System";
+    x86_64-darwin = "System";
   }.${stdenv.hostPlatform.system} or (throw "unsupported system: ${stdenv.hostPlatform.system}");
 in stdenv.mkDerivation {
   name = "ut1999";
@@ -53,38 +58,42 @@ in stdenv.mkDerivation {
     stdenv.cc.cc
   ];
 
-  nativeBuildInputs = [
+  nativeBuildInputs = lib.optionals stdenv.isLinux [
     copyDesktopItems
     autoPatchelfHook
     imagemagick
+  ] ++ lib.optionals stdenv.isDarwin [
+    undmg
   ];
 
-  installPhase = ''
+  installPhase = let
+    outPrefix = if stdenv.isDarwin then "$out/UnrealTournament.app/Contents/MacOS" else "$out";
+  in ''
     runHook preInstall
 
     mkdir -p $out/bin
-    cp -r ./* $out
-
-    # Remove bundled libraries to use native versions instead
-    rm $out/${systemDir}/libmpg123.so* \
-      $out/${systemDir}/libopenal.so* \
-      $out/${systemDir}/libSDL2* \
-      $out/${systemDir}/libxmp.so*
-
+    cp -r ${if stdenv.isDarwin then "UnrealTournament.app" else "./*"} $out
     chmod -R 755 $out
+    cd ${outPrefix}
 
-    ln -s ${unpackGog}/Music $out
-    ln -s ${unpackGog}/Sounds $out
-    cp -n ${unpackGog}/Textures/* $out/Textures || true
-    ln -s ${unpackGog}/Maps $out
-    cp -n ${unpackGog}/System/*.{u,int} $out/System || true
+    rm -rf ./{Music,Sounds,Maps}
+    ln -s ${unpackGog}/{Music,Sounds,Maps} .
 
+    cp -n ${unpackGog}/Textures/* ./Textures || true
+    cp -n ${unpackGog}/System/*.{u,int} ./System || true
+  '' + lib.optionalString (stdenv.isLinux) ''
     ln -s "$out/${systemDir}/ut-bin" "$out/bin/ut1999"
     ln -s "$out/${systemDir}/ucc-bin" "$out/bin/ut1999-ucc"
 
     convert "${unpackGog}/gfw_high.ico" "ut1999.png"
     install -D ut1999-5.png "$out/share/icons/hicolor/256x256/apps/ut1999.png"
 
+    # Remove bundled libraries to use native versions instead
+    rm $out/${systemDir}/libmpg123.so* \
+      $out/${systemDir}/libopenal.so* \
+      $out/${systemDir}/libSDL2* \
+      $out/${systemDir}/libxmp.so*
+  '' + ''
     runHook postInstall
   '';