C41 or C-41 may be: Vehicles C-41 (rocket), an Italian sounding rocket Alfa Romeo Racing C41, an Italian Formula One car CASA C-41, a Spanish light transport aircraft in use by the United States Armed Forces Courage C41, a French racing car Douglas C-41, an American military transport aircraft Other uses C-41 process, for developing colour negative film C41 road (Namibia) Bone tumor Caldwell 41, the Hyades star cluster Philidor Defence, a chess opening