In Greek mythology, Clymenus, or Klyménos ("notorious") may refer to any number of individuals:
- Clymenus was the father of Eurydice.
- Clymenus was the son of King Oeneus of Calydon and Althaea. Was killed whilst battling the Curetes.
- Clymenus was the son of Phoroneus by either Cerdo or Teledice or Cinna
- Clymenus was the son of Presbon and a King of Orchomenos
- Clymenus was a King of Boeotia and father of Phaeton by Merope, and also of Erginus
- Clymenus from Dulichium was one of the suitors of Penelope
- Clymenus was killed by Hodites during the fight between Phineus and Perseus.
- Clymenus was the son of Cardys and a descendant of Heracles of Ida. He became king of Olympia but was deposed by Endymion: "What is more, the Olympian Games are an invention of theirs [the Daktyloi]; and it was they who celebrated the first Olympiads, for one should disregard the ancient stories both of the founding of the temple and of the establishment of the games - some alleging that it was Herakles, one of the Idaian Daktyloi, who was the originator of both, and others, that it was Herakles the son of Alkmene and Zeus, who also was the first to contend in the games and win the victory; for such stories are told in many ways, and not much faith is to be put in them." - Strabo, Geography 8.3.30
- Clymenus, king of Arcadia, was the son of either Schoeneus or Teleus. He committed incest with his daughter Harpalyce.
- Clymenus was also an alternate name for Hades.
- Clymenus, one of the Argonauts, and the brother of Iphiclus.
