Plaspoelhaven is a private marina located in Leidschendam, alongside the Rijn-Schiekanaal in the Dutch province of Zuid-Holland. The haven is not publicly accessible by water; entry is restricted to berth holders and controlled by a drawbridge.

The bridge is fully electrified, with automated barriers, locks, and a winch mechanism. The marina is managed by Stichting Plaspoelhaven, which handles berth allocation and maintains a waiting list for interested boaters.

A priority zone system governs who may apply for a berth, based on proximity to the bridge entrance.

The haven features a notable artwork called "Het Havennest," a sculpture combining a tree form with bronze branches shaped into a Kolibri boat, referencing the area's historical shipbuilding heritage and local waterbird habitat.