diff --git a/pkgs/applications/office/karlender/default.nix b/pkgs/applications/office/karlender/default.nix
new file mode 100644
index 000000000000..44cd2ed0051f
--- /dev/null
+++ b/pkgs/applications/office/karlender/default.nix
@@ -0,0 +1,60 @@
+{ lib
+, rustPlatform
+, fetchFromGitLab
+, pkg-config
+, gtk4
+, libadwaita
+, wrapGAppsHook4
+, glib
+, tzdata
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "karlender";
+  version = "0.6.2";
+
+  src = fetchFromGitLab {
+    owner = "loers";
+    repo = "karlender";
+    rev = "v${version}";
+    sha256 = "sha256-YF46C+Vz7eGl4lqOQXqiQqaa6ieo1p8l6QCh4oNSJEg=";
+  };
+
+  cargoSha256 = "sha256-Kx5K2tp5PAQWac8LVrmOsk8Qf9m34SJ1vyfv7Ef2Wr0=";
+
+  nativeBuildInputs = [
+    pkg-config
+    wrapGAppsHook4
+    glib
+  ];
+  buildInputs = [
+    gtk4
+    libadwaita
+  ];
+
+  postPatch = ''
+    substituteInPlace src/domain/time.rs --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
+  '';
+
+  postInstall = ''
+    substituteInPlace target/gra-gen/data/codes.loers.Karlender.desktop \
+      --replace "Exec=codes.loers.Karlender" "Exec=karlender"
+    substituteInPlace target/gra-gen/data/codes.loers.Karlender.appdata.xml \
+      --replace "<binary>codes.loers.Karlender</binary>" "<binary>karlender</binary>"
+    install -Dm444 target/gra-gen/codes.loers.Karlender.gschema.xml -t $out/share/gsettings-schemas/$name/glib-2.0/schemas/
+    glib-compile-schemas $out/share/gsettings-schemas/$name/glib-2.0/schemas/
+    install -Dm444 target/gra-gen/data/codes.loers.Karlender.svg -t $out/share/icons/hicolor/scalable/apps/
+    install -Dm444 target/gra-gen/data/codes.loers.Karlender.64.png -T $out/share/icons/hicolor/64x64/apps/codes.loers.Karlender.png
+    install -Dm444 target/gra-gen/data/codes.loers.Karlender.128.png -T $out/share/icons/hicolor/128x128/apps/codes.loers.Karlender.png
+    install -Dm444 target/gra-gen/data/codes.loers.Karlender.desktop -t $out/share/applications/
+    install -Dm444 target/gra-gen/data/codes.loers.Karlender.appdata.xml -t $out/share/metainfo/
+  '';
+
+  meta = with lib; {
+    description = "Mobile-friendly GTK calendar application";
+    homepage = "https://gitlab.com/loers/karlender";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ chuangzhu ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 8cbbb7966ae9..f47ccce69b94 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -27899,6 +27899,8 @@ with pkgs;
 
   icesl = callPackage ../applications/misc/icesl { };
 
+  karlender = callPackage ../applications/office/karlender { };
+
   keepassx = callPackage ../applications/misc/keepassx { };
   keepassx2 = callPackage ../applications/misc/keepassx/2.0.nix { };
   keepassxc = libsForQt5.callPackage ../applications/misc/keepassx/community.nix { };