WSV Jan Ploegensluis is a watersports association and marina located on the Amstel near Uithoorn, Noord-Holland.

It takes its name from the historic Jan Ploegensluis, a lock built in 1670 that once provided a shipping connection between the Amstel and the Uithoornse polder.

The lock was filled in 1987, though its doors are still preserved at the pedestrian entrance to the association's grounds. The site includes a trailer ramp on the Amstel at Jaagpad, with a depth of approximately 3 metres below chart datum.

Visiting boaters are welcome and can register through the association's website; the harbourmaster passes by in the early evening for payment and verification.