Wsv De Kooihaven is a members' watersports association and marina situated on the industrial estate De Waard in Leiden, at the junction of the Oude Rijn and the Zijl.

Founded in March 1974, the association gained its own dedicated harbour in 1987 after lengthy negotiations with the municipality of Leiden. The marina offers 46 berths ranging from 2. 5 to 13 metres in length.

The location provides direct access to the city centre of Leiden as well as the Kagerplassen. Facilities include water, electricity, and sanitary provisions, with sheltered box-style moorings on pontoons.

The association operates year-round and caters primarily to recreational boaters of all experience levels. Note that the marina does not accept transient visitors — berths are reserved for members only.