- In Greek mythology, Mopsus was the son of Ampyx and Chloris. He helped hunt the Calydonian Boar and was one of the Argonauts (specifically, he was their seer.).
- The son of Manto and Rhacius or Apollo. This Mopsus was a famous seer and helped Amphilochus found the Apollonion oracle at Colophon. He also beat Calchas at a soothsaying contest; Calchas died in shame and disappointment.