Cleitus, is the English form of the personal name Kleitos (Greek Κλείτος, which may in turn derive from Greek kleos glory). It has been adopted as an English personal name in modern times mainly in the U.S., and usually with a modern spelling Claitus. Classical scholarship uses the traditional spelling.
It may refer to:
* Cleitus the Black (c. 375–328 BC), a Macedonian officer and friend of Alexander the Great, killed by the latter after an argument.
* Cleitus the White, a Macedonian officer who rose to prominence after Alexander the Great's death.
* Cleitus the Illyrian, an Illyrian king.
* Cleitus, a Trojan, son of Pisenoros (Πεισήνορος), friend of Polydamantos, whom Teucer killed.
* Cleitus, son of Mantius, who was abducted by Eos because of his beauty. After his death, he was placed among other immortals.