Vartholomio is a town and a former municipality in Elis, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Pineios, of which it is a municipal unit. Its population was 5,348 in 2001, of which 3,093 lived in the town proper. The municipal unit covers the southern part of the hilly Kyllini peninsula, and the plains to the southeast. The town Vartholomio is in the plains, on the right bank of the river Pineios, which flows into the Ionian Sea south of the town.