In Greek mythology, Olenus (or Olenos) was the name of several individuals:

1. Olenus was the son of Hephaestus and father of Helice and Aex. A city was named for him.
2. Olenus was the father of Tectaphus the Lapith.
3. Olenus was a man who lived on Mt. Ida. His wife Lethaea claimed she was more beautiful than any goddess. They were both turned to stone; although Olenus could have avoided this fate, he chose to be with his wife.
4. Olenus was the father of Phoceus.

Not to be confused with Olenius.