Buizengat is a historic inland harbour in the eastern part of Rotterdam, dating back to 1699. It lies east of the Boerengat, which was dug in 1591, and is connected to the Nieuwe Maas via a sluice canal.

The name refers to the haringbuizen — traditional herring fishing vessels — that once called this harbour home. Before 1699, the name "Buysse Gat" referred to the eastern entrance to the Haringvliet.

The harbour features two small branch basins that formerly served Rotterdam's municipal sanitation department, where refuse carts would unload waste into smaller vessels for transport across the Nieuwe Maas.

In recent years, the city of Rotterdam and Rijkswaterstaat have added approximately 1,000 square metres of floating greenery to this historic basin in the Kralingen district.