Oude-Tonge is a town in the Dutch province of South Holland. It is a part of the municipality of Goeree-Overflakkee, and lies about 16 km south of Hellevoetsluis. In 2001, the town of Oude-Tonge had 4,164 inhabitants. The built-up area of the town was 0.9 km², and contained 1,615 residences.