Caerus - (a.k.a. Kairos, Occasio, Tempus) The (minor) god of luck and opportunity.
Calliope - One of the Muses. Represented epic poetry.
Calypso - (a.k.a. Kalypso) The sea nymph who held Odysseus prisoner for seven years.
Castor - (a.k.a. Castore, Kastor) One of the twins who represent Gemini.
Celaeno - The name of a wife of Poseidon.
Cerus - The wild bull tamed by Persephone, made into the Taurus constellation.
Ceto - (a.k.a. Keto) a sea monster goddess who was also the mother of other sea monsters.
Chaos - (a.k.a. Khaos) The nothingness that all else sprung from.
Charon - (a.k.a. Charun) The Ferryman of Hades. He had to be paid to help one cross the river Styx.
Chronos - (a.k.a. Chronus, Khronos) God of time.
Circe - (a.k.a. Kirke) A goddess who transformed her enemies into beasts.
Clio - One of the Muses. She represented History.
Clotho - (a.k.a. Nona) One of the Fates - Spun the thread of life from her distaff onto her spindle.
Crios - The crab who protected the sea nymphs, made into the Cancer constellation.
Cronus - (a.k.a. Cronos, Kronos, Saturn) God of agriculture and time, father of the Titans.
Cybele - (a.k.a. Agdistis, Magna Mater, Meter, Meter Oreie) Goddess of caverns, mountains, nature and wild animals