(Θηρίμαχος), was the Spartan harmost at Methymna in Lesbos, when the city was attacked by Thrasybulus, the Athenian, in B. C. 390. Therimachus gave battle to the enemy, and was defeated and slain. These events are placed by Diodorus in B. C. 392. (Xen. Hell. 5.8. §§ 28, 29; Diod. 14.94.)