Heenvliet is a town in the Dutch province of South Holland. It is a part of the municipality of Nissewaard, and lies about 7 km south of Maassluis, on the Brielse Maas. Heenvliet was a separate municipality until 1980, when it became part of Bernisse. In 2001, the town of Heenvliet had 2,675 inhabitants. The built-up area of the town was 0.36 km2, and contained 1,064 residences. The wider statistical district of Heenvliet, which covers that part of the "Polder Heenvliet" that is in Bernisse, has a population of around 2,700. The historic ruins of Ravesteyn Castle are located in the town.