Plaspoelhaven is a municipal harbour in Leidschendam-Voorburg, situated on the Rijn-Schiekanaal.

It serves as a mooring point for both permanent residents and visiting boaters, with transient berths available for stays of up to three consecutive 24-hour periods, as marked by signage along the waterway.

The harbour is managed by Stichting Plaspoelhaven on behalf of the municipality, and a waiting list exists for those seeking a fixed berth.

The harbour gained additional character through the expansion of the Plaspoelpolder area as part of the broader redevelopment of Leidschendam-Centrum.

A pedestrian and cyclist bridge designed by Bureau West 8 crosses the water nearby, and beside it stands a bronze sculpture called "Havennest," created by artist duo Albert Dedden and Paul Keizer.

The work takes the form of a lifelike tree trunk topped with a nest of branches and twigs, referencing the area's original vegetation, local boatbuilding heritage, and the masts of the harbour itself.