De Zeemeermin is a marina situated on the Vecht near Weesp, in the Noord-Holland region of the Netherlands. Member-managed and run as a sailing association, it welcomes both its own members and visiting sailors passing through on the Vecht.

The marina offers 90 well-maintained berths ranging from small boxes of around 4 metres to larger ones of 12 metres in length and 3. 85 metres in width. Visiting boaters can contact the harbour master on arrival or call ahead to check availability.