Jachthaven Plaatselijk Belang Oosterzee is a small marina on the southern shore of the Tsjûkemar (Tjeukemeer), the largest inland lake in the province of Fryslân, located in the village of Oosterzee in the municipality of De Fryske Marren.

The marina is operated by the local community association, Plaatselijk Belang, and offers around 12 visitor berths alongside shore power and drinking water connections. Toilet and shower facilities are available at the adjacent small-scale camping.

The broader waterfront area includes a sandy beach protected by a breakwater, a trailer ramp, and a cycling and walking path running directly along the lake. The Tsjûkemar provides opportunities for sailing, windsurfing, canoeing, and swimming.