Binnenmaas (population: 19,209) is a municipality in the western Netherlands, in the province of South Holland. The municipality covers an area of 54.91 km² (of which 4.21 km² water).
The municipality of Binnenmaas consists the following towns, villages and townships: Blaaksedijk, Goidschalxoord, Greup, Heinenoord, Kuipersveer, Maasdam, Mijnsheerenland, Puttershoek, Sint Anthoniepolder, Westmaas.