Thyestes was the mythical king of Olympia.

Thyestes may also refer to: Thyestes (Euripides), a lost Greek tragedy by Euripides Thyestes (Ennius), a lost Latin tragedy by Ennius Thyestes (Seneca), a Latin tragedy by Seneca Mount Thyestes, in Canada Thyestes (fish), a genus of fossil fish 14792 Thyestes, an asteroid

See also Thyestes Chase, a National Hunt handicap steeplechase run in Ireland