Menedemus of Eretria (; 345/4 – 261/0 BC) was a Greek philosopher and founder of the Eretrian school. He learned philosophy first in Athens, and then, with his friend Asclepiades, he subsequently studied under Stilpo and Phaedo of Elis. Nothing survives of his philosophical views apart from a few scattered remarks recorded by later writers.
Menedemus was one of the generals of Alexander the Great, who was sent in 329 BC against Spitamenes, satrap of Sogdiana, but was surprised and slain, together with 2000 foot-soldiers and 300 horse.
Menedemus was a Greek philosopher and founder of the Eretrian school.
Menedemus may also refer to:
- Menedemus (general), one of the generals of Alexander the Great
- Menedemus of Pyrrha, a member of Plato's Academy
- Menedemus the Cynic, a Cynic philosopher