diff --git a/pkgs/by-name/up/upscaler/package.nix b/pkgs/by-name/up/upscaler/package.nix
new file mode 100644
index 000000000000..c8ce29d532a3
--- /dev/null
+++ b/pkgs/by-name/up/upscaler/package.nix
@@ -0,0 +1,92 @@
+{
+  lib,
+  fetchFromGitLab,
+  glib,
+  gtk4,
+  meson,
+  ninja,
+  gitUpdater,
+  desktop-file-utils,
+  appstream,
+  blueprint-compiler,
+  python3Packages,
+  pkg-config,
+  libadwaita,
+  wrapGAppsHook4,
+  upscayl-ncnn,
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "upscaler";
+  version = "1.4.0";
+
+  pyproject = false; # meson instead of pyproject
+
+  src = fetchFromGitLab {
+    domain = "gitlab.gnome.org";
+    owner = "World";
+    repo = "Upscaler";
+    rev = version;
+    hash = "sha256-Dy8tykIbK5o0XulurG+TxORZZSxfRe5Kjh6aGpsh+0Y=";
+  };
+
+  passthru.updateScript = gitUpdater { };
+
+  postPatch = ''
+    substituteInPlace upscaler/window.py \
+      --replace-fail '"upscayl-bin",' '"${lib.getExe upscayl-ncnn}",'
+  '';
+
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    wrapGAppsHook4
+    meson
+    ninja
+    desktop-file-utils
+    appstream
+    blueprint-compiler
+    pkg-config
+    gtk4
+    glib
+  ];
+
+  dependencies = with python3Packages; [
+    pygobject3
+    pillow
+    vulkan
+  ];
+
+  buildInputs = [
+    libadwaita
+    upscayl-ncnn
+  ];
+
+  mesonFlags = [
+    (lib.mesonBool "network_tests" false)
+  ];
+
+  # NOTE: `postCheck` is intentionally not used here, as the entire checkPhase
+  # is skipped by `buildPythonApplication`
+  # https://github.com/NixOS/nixpkgs/blob/9d4343b7b27a3e6f08fc22ead568233ff24bbbde/pkgs/development/interpreters/python/mk-python-derivation.nix#L296
+  postInstallCheck = ''
+    mesonCheckPhase
+  '';
+
+  dontWrapGApps = true;
+
+  makeWrapperArgs = [ "\${gappsWrapperArgs[@]}" ];
+
+  meta = {
+    description = "Upscale and enhance images";
+    homepage = "https://tesk.page/upscaler";
+    license = lib.licenses.gpl3Only;
+    maintainers = with lib.maintainers; [
+      grimmauld
+      getchoo
+      aleksana
+    ];
+    mainProgram = "upscaler";
+    platforms = lib.platforms.linux;
+  };
+}