Maashaven is a harbor located in the south of Rotterdam, along the Maas — the Dutch stretch of the Meuse river. The name combines Maas (the river) and haven (the Dutch word for harbor), reflecting its direct connection to the waterway.

The area is also served by an above-ground metro station of the same name, which opened on 9 February 1968 as part of Rotterdam Metro lines D and E.

The station sits just east of the harbor itself, making Maashaven accessible by public transit from central Rotterdam and surrounding districts.