diff --git a/pkgs/colcon/defaults.nix b/pkgs/colcon/defaults.nix
new file mode 100644
index 0000000000..a0cd299013
--- /dev/null
+++ b/pkgs/colcon/defaults.nix
@@ -0,0 +1,28 @@
+{ lib, buildPythonPackage, fetchPypi, isPy27, colcon-core, pyyaml }:
+
+buildPythonPackage rec {
+  pname = "colcon-defaults";
+  version = "0.2.8";
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-BT6KGPuuBM8YKilo1/ftR0xRJb87MGuASSUFdPQJb6E=";
+  };
+
+  propagatedBuildInputs = [
+    colcon-core
+    pyyaml
+  ];
+
+  # Requires unpackaged dependencies
+  doCheck = false;
+
+  disabled = isPy27;
+
+  meta = with lib; {
+    description = "An extension for colcon-core to provide custom default values for the command line arguments from a configuration file.";
+    homepage = "https://colcon.readthedocs.io/en/released/user/configuration.html#defaults-yaml";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lopsided98 ];
+  };
+}
diff --git a/pkgs/default.nix b/pkgs/default.nix
index e5f6c2a302..19886f75f2 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -14,6 +14,8 @@ self: super: with self.lib; let
 
       colcon-core = pyFinal.callPackage ./colcon/core.nix { };
 
+      colcon-defaults = pyFinal.callPackage ./colcon/defaults.nix { };
+
       colcon-library-path = pyFinal.callPackage ./colcon/library-path.nix { };
 
       colcon-metadata = pyFinal.callPackage ./colcon/metadata.nix { };
@@ -57,6 +59,7 @@ in {
   colcon = with self.python3Packages; colcon-core.withExtensions [
     colcon-cmake
     colcon-core
+    colcon-defaults
     colcon-library-path
     colcon-metadata
     colcon-package-information