diff --git a/plugins/default.nix b/plugins/default.nix
index 1cad2154..b941c691 100644
--- a/plugins/default.nix
+++ b/plugins/default.nix
@@ -34,6 +34,7 @@
     ./filetrees/neo-tree.nix
     ./filetrees/nvim-tree.nix
 
+    ./git/committia.nix
     ./git/diffview.nix
     ./git/fugitive.nix
     ./git/git-worktree.nix
diff --git a/plugins/git/committia.nix b/plugins/git/committia.nix
new file mode 100644
index 00000000..c6762426
--- /dev/null
+++ b/plugins/git/committia.nix
@@ -0,0 +1,51 @@
+{
+  lib,
+  config,
+  helpers,
+  pkgs,
+  ...
+}:
+helpers.vim-plugin.mkVimPlugin config {
+  name = "committia";
+  description = "committia.vim";
+  package = pkgs.vimPlugins.committia-vim;
+  globalPrefix = "committia_";
+  extraPackages = [pkgs.git];
+
+  maintainers = [lib.maintainers.alisonjenkins];
+
+  settingsOptions = {
+    open_only_vim_starting = helpers.defaultNullOpts.mkBool true ''
+      If `false`, committia.vim always attempts to open committia's buffer when `COMMIT_EDITMSG` buffer is opened.
+      If you use `vim-fugitive`, I recommend to set this value to `true`.
+    '';
+
+    use_singlecolumn = helpers.defaultNullOpts.mkStr "always" ''
+      If the value is 'always', `committia.vim` always employs single column mode.
+    '';
+
+    min_window_width = helpers.defaultNullOpts.mkUnsignedInt 160 ''
+      If the width of window is narrower than the value, `committia.vim` employs single column mode.
+    '';
+
+    status_window_opencmd = helpers.defaultNullOpts.mkStr "belowright split" ''
+      Vim command which opens a status window in multi-columns mode.
+    '';
+
+    diff_window_opencmd = helpers.defaultNullOpts.mkStr "botright vsplit" ''
+      Vim command which opens a diff window in multi-columns mode.
+    '';
+
+    singlecolumn_diff_window_opencmd = helpers.defaultNullOpts.mkStr "belowright split" ''
+      Vim command which opens a diff window in single-column mode.
+    '';
+
+    edit_window_width = helpers.defaultNullOpts.mkUnsignedInt 80 ''
+      If `committia.vim` is in multi-columns mode, specifies the width of the edit window.
+    '';
+
+    status_window_min_height = helpers.defaultNullOpts.mkUnsignedInt 0 ''
+      Minimum height of a status window.
+    '';
+  };
+}
diff --git a/tests/test-sources/plugins/git/committia.nix b/tests/test-sources/plugins/git/committia.nix
new file mode 100644
index 00000000..aecf8764
--- /dev/null
+++ b/tests/test-sources/plugins/git/committia.nix
@@ -0,0 +1,22 @@
+{
+  empty = {
+    plugins.committia.enable = true;
+  };
+
+  default = {
+    plugins.committia = {
+      enable = true;
+
+      settings = {
+        open_only_vim_starting = true;
+        use_singlecolumn = "always";
+        min_window_width = 160;
+        status_window_opencmd = "belowright split";
+        diff_window_opencmd = "botright vsplit";
+        singlecolumn_diff_window_opencmd = "belowright split";
+        edit_window_width = 80;
+        status_window_min_height = 0;
+      };
+    };
+  };
+}