Ion Dragoumis () is a former municipality in Kastoria regional unit, West Macedonia, Greece. Since the 2011 local government reform it is part of the municipality Orestida, of which it is a municipal unit. It was named after the Greek diplomat and protagonist of the Macedonian Struggle, Ion Dragoumis. The municipal unit has an area of 134.335 km2. Population 2,899 (2011). The seat of the municipality was in Vogatsiko.