diff --git a/modules/kde.nix b/modules/kde.nix
new file mode 100644
index 0000000..0c379cf
--- /dev/null
+++ b/modules/kde.nix
@@ -0,0 +1,54 @@
+{ config, pkgs, ... }:
+{
+  # KDE desktop environment.
+  # See also: gnome-base.nix
+  # https://nixos.wiki/wiki/KDE
+
+  # TODO: if including modules that enable dconf, KDE does not start. Maybe some conflicting configs in ~/ from GNOME? Create new (blank) user and try to log in with it.
+
+  # TODO: Declarative KDE setting adjustments.
+  #   - Plasma > Breeze Dark
+  #   - Global theme > Breeze Dark
+  #   - Touchpad > Invert scroll direction (natural scrolling)
+  #   - Touchpad > Tap to click > unchecked
+  #   - File search > Also index file content
+  #   - On AC power > Button events handling > When laptop lid is closed > Do nothing
+  #   - On AC power > Suspend session -> unchecked
+
+  imports = [
+    ./audio.nix
+  ];
+
+  # Enable the X11 windowing system.
+  services.xserver.enable = true;
+
+  # Enable the KDE desktop environment
+  #services.xserver.displayManager.sddm.enable = true;
+  services.xserver.displayManager.gdm.enable = true;
+  services.xserver.desktopManager.plasma5.enable = true;
+
+  # Don't install all programs of the KDE desktop.
+#  environment.plasma5.excludePackages = with pkgs.libsForQt5; [
+#    plasma-browser-integration
+#    konsole
+#    oxygen
+#  ];
+
+  # GNOME desktop integration.
+  # Using the following example configuration, QT applications will have a look similar to the GNOME desktop, using a dark theme
+  qt = {
+    enable = true;
+    platformTheme = "gnome";
+    style = "adwaita-dark";
+  };
+
+  # Configure keymap in X11.
+  services.xserver = {
+    layout = "de";
+    xkbVariant = "nodeadkeys";
+  };
+
+  # Enable Bluetooth support
+  # https://nixos.wiki/wiki/Bluetooth
+  hardware.bluetooth.enable = true;
+}