diff --git a/modules/programs/btop.nix b/modules/programs/btop.nix
index 61c7f795a..a93716164 100644
--- a/modules/programs/btop.nix
+++ b/modules/programs/btop.nix
@@ -41,6 +41,58 @@ in {
       '';
     };
 
+    themes = lib.mkOption {
+      type = with lib.types; lazyAttrsOf (either path lines);
+      default = { };
+      example = ''
+        theme[main_bg]="#282a36"
+        theme[main_fg]="#f8f8f2"
+        theme[title]="#f8f8f2"
+        theme[hi_fg]="#6272a4"
+        theme[selected_bg]="#ff79c6"
+        theme[selected_fg]="#f8f8f2"
+        theme[inactive_fg]="#44475a"
+        theme[graph_text]="#f8f8f2"
+        theme[meter_bg]="#44475a"
+        theme[proc_misc]="#bd93f9"
+        theme[cpu_box]="#bd93f9"
+        theme[mem_box]="#50fa7b"
+        theme[net_box]="#ff5555"
+        theme[proc_box]="#8be9fd"
+        theme[div_line]="#44475a"
+        theme[temp_start]="#bd93f9"
+        theme[temp_mid]="#ff79c6"
+        theme[temp_end]="#ff33a8"
+        theme[cpu_start]="#bd93f9"
+        theme[cpu_mid]="#8be9fd"
+        theme[cpu_end]="#50fa7b"
+        theme[free_start]="#ffa6d9"
+        theme[free_mid]="#ff79c6"
+        theme[free_end]="#ff33a8"
+        theme[cached_start]="#b1f0fd"
+        theme[cached_mid]="#8be9fd"
+        theme[cached_end]="#26d7fd"
+        theme[available_start]="#ffd4a6"
+        theme[available_mid]="#ffb86c"
+        theme[available_end]="#ff9c33"
+        theme[used_start]="#96faaf"
+        theme[used_mid]="#50fa7b"
+        theme[used_end]="#0dfa49"
+        theme[download_start]="#bd93f9"
+        theme[download_mid]="#50fa7b"
+        theme[download_end]="#8be9fd"
+        theme[upload_start]="#8c42ab"
+        theme[upload_mid]="#ff79c6"
+        theme[upload_end]="#ff33a8"
+        theme[process_start]="#50fa7b"
+        theme[process_mid]="#59b690"
+        theme[process_end]="#6272a4"
+      '';
+      description = ''
+        Themes to be written to {file}`$XDG_CONFIG_HOME/btop/themes/''${name}.theme`
+      '';
+    };
+
     extraConfig = lib.mkOption {
       type = lib.types.lines;
       default = "";
@@ -53,7 +105,18 @@ in {
   config = lib.mkIf cfg.enable {
     home.packages = lib.mkIf (cfg.package != null) [ cfg.package ];
 
-    xdg.configFile."btop/btop.conf" =
-      lib.mkIf (cfg.settings != { }) { text = finalConfig; };
+    xdg.configFile = let
+      mkThemeConfig = name: theme: {
+        name = "btop/themes/${name}.theme";
+        value = {
+          source = (if builtins.isPath theme || lib.isStorePath theme then
+            theme
+          else
+            pkgs.writeText "btop-theme.theme" theme);
+        };
+      };
+    in {
+      "btop/btop.conf" = lib.mkIf (cfg.settings != { }) { text = finalConfig; };
+    } // lib.mapAttrs' mkThemeConfig cfg.themes;
   };
 }
diff --git a/tests/modules/programs/btop/example-settings.nix b/tests/modules/programs/btop/example-settings.nix
index bbd3649c5..f37821cc5 100644
--- a/tests/modules/programs/btop/example-settings.nix
+++ b/tests/modules/programs/btop/example-settings.nix
@@ -24,11 +24,59 @@
     extraConfig = ''
       clock_format = "%H:%M"
     '';
+
+    themes.example = ''
+      theme[main_bg]="#282a36"
+      theme[main_fg]="#f8f8f2"
+      theme[title]="#f8f8f2"
+      theme[hi_fg]="#6272a4"
+      theme[selected_bg]="#ff79c6"
+      theme[selected_fg]="#f8f8f2"
+      theme[inactive_fg]="#44475a"
+      theme[graph_text]="#f8f8f2"
+      theme[meter_bg]="#44475a"
+      theme[proc_misc]="#bd93f9"
+      theme[cpu_box]="#bd93f9"
+      theme[mem_box]="#50fa7b"
+      theme[net_box]="#ff5555"
+      theme[proc_box]="#8be9fd"
+      theme[div_line]="#44475a"
+      theme[temp_start]="#bd93f9"
+      theme[temp_mid]="#ff79c6"
+      theme[temp_end]="#ff33a8"
+      theme[cpu_start]="#bd93f9"
+      theme[cpu_mid]="#8be9fd"
+      theme[cpu_end]="#50fa7b"
+      theme[free_start]="#ffa6d9"
+      theme[free_mid]="#ff79c6"
+      theme[free_end]="#ff33a8"
+      theme[cached_start]="#b1f0fd"
+      theme[cached_mid]="#8be9fd"
+      theme[cached_end]="#26d7fd"
+      theme[available_start]="#ffd4a6"
+      theme[available_mid]="#ffb86c"
+      theme[available_end]="#ff9c33"
+      theme[used_start]="#96faaf"
+      theme[used_mid]="#50fa7b"
+      theme[used_end]="#0dfa49"
+      theme[download_start]="#bd93f9"
+      theme[download_mid]="#50fa7b"
+      theme[download_end]="#8be9fd"
+      theme[upload_start]="#8c42ab"
+      theme[upload_mid]="#ff79c6"
+      theme[upload_end]="#ff33a8"
+      theme[process_start]="#50fa7b"
+      theme[process_mid]="#59b690"
+      theme[process_end]="#6272a4"
+    '';
   };
 
   nmt.script = ''
     assertFileContent \
       home-files/.config/btop/btop.conf \
       ${./example-settings-expected.conf}
+    assertFileContent \
+      home-files/.config/btop/themes/example.theme \
+      ${./example-theme-expected.theme}
   '';
 }
diff --git a/tests/modules/programs/btop/example-theme-expected.theme b/tests/modules/programs/btop/example-theme-expected.theme
new file mode 100644
index 000000000..d4e6ff539
--- /dev/null
+++ b/tests/modules/programs/btop/example-theme-expected.theme
@@ -0,0 +1,42 @@
+theme[main_bg]="#282a36"
+theme[main_fg]="#f8f8f2"
+theme[title]="#f8f8f2"
+theme[hi_fg]="#6272a4"
+theme[selected_bg]="#ff79c6"
+theme[selected_fg]="#f8f8f2"
+theme[inactive_fg]="#44475a"
+theme[graph_text]="#f8f8f2"
+theme[meter_bg]="#44475a"
+theme[proc_misc]="#bd93f9"
+theme[cpu_box]="#bd93f9"
+theme[mem_box]="#50fa7b"
+theme[net_box]="#ff5555"
+theme[proc_box]="#8be9fd"
+theme[div_line]="#44475a"
+theme[temp_start]="#bd93f9"
+theme[temp_mid]="#ff79c6"
+theme[temp_end]="#ff33a8"
+theme[cpu_start]="#bd93f9"
+theme[cpu_mid]="#8be9fd"
+theme[cpu_end]="#50fa7b"
+theme[free_start]="#ffa6d9"
+theme[free_mid]="#ff79c6"
+theme[free_end]="#ff33a8"
+theme[cached_start]="#b1f0fd"
+theme[cached_mid]="#8be9fd"
+theme[cached_end]="#26d7fd"
+theme[available_start]="#ffd4a6"
+theme[available_mid]="#ffb86c"
+theme[available_end]="#ff9c33"
+theme[used_start]="#96faaf"
+theme[used_mid]="#50fa7b"
+theme[used_end]="#0dfa49"
+theme[download_start]="#bd93f9"
+theme[download_mid]="#50fa7b"
+theme[download_end]="#8be9fd"
+theme[upload_start]="#8c42ab"
+theme[upload_mid]="#ff79c6"
+theme[upload_end]="#ff33a8"
+theme[process_start]="#50fa7b"
+theme[process_mid]="#59b690"
+theme[process_end]="#6272a4"