De Rietpol is a marina located in the village of Spaarndam, situated on a small island in the Spaarne.

Arriving from the North Sea Channel, the harbour lies beside Grote Sluis on the Spaarne River, adjacent to Kolksluis, reputed to be the oldest lock in Europe. The marina offers around 100 berths plus 25 visitor berths, with a maximum air draft of 10. 5 metres.

From De Rietpol, boaters can easily reach Buiten Spaarne and Haarlem. The site includes a water sports shop and tackle equipment, and a supermarket, restaurants, playgrounds, and a fuel store are within walking distance.

The marina is currently undergoing redevelopment as part of the future Spaarnedock project.