Sellasia (Greek: Σελλασία, before 1929: Βρουλιά - Vroulia) is a village in Laconia, Greece. It was the seat of the former municipality Oinountas. Since 2011, it is part of the municipality of Sparta. Sellasia is situated on the edge of the Eurotas valley, 10 km north of Sparta. The Greek National Road 39 (Sparta - Tripoli) passes east of the village. Sellasia is known for the cultivation of olives.