The Alpheios is a river running through Elis and Arkadia in Peloponnese.
The Altar of Zeus within the Sanctuary of Olympia in the Valley of Olympia was said to have been made with the sacrificial ash of the burnt oxen mixed with the water from the river.
During the Peloponnesian War, a military camp was set up along the river and named after it.
When the Alpheios flooded in the Middle Ages along with the river Kladeos, the Sanctuary of Olympia was buried under four meters of silt, and was eventually rediscovered in the 19th century.
- The river is named after the river-god Alpheus.