C23 or C-23 may refer to:
Vehicles Aircraft Beechcraft C23 Musketeer, an American civil utility aircraft Caspar C 23, a German sport aircraft Caudron C.23, a French bomber biplane Lockheed C-23 Altair, an American military transport Short C-23 Sherpa, an American military transport
Automobiles Sauber C23, a Swiss Formula One car
Ships and boats , a C-class submarine of the Royal Navy Maltese patrol boat C23, involved in the C23 tragedy
Other uses C23 (C standard revision), a revision of the C programming language C-23 (card game), a collectible card game by Wizards of the Coast C23 road (Namibia) Bishop's Opening, a chess opening Caldwell 23, a spiral galaxy Gallbladder cancer
See also List of compounds with carbon number 23