Van Merlenhaven is a marina operated by Watersportvereniging Van Merlenhaven in Heemstede, Noord-Holland.

It sits along the staande mastroute — the inland route connecting the Zeeuwse waters with the IJsselmeer — and is accessible via the Ringvaart van de Haarlemmermeerpolder.

The harbor offers around 65 berths and accommodates vessels up to 15 meters in length with a maximum draft of 1. 80 meters. The marina is situated near the Groenendaal forest and within walking distance of Heemstede's town center.

Nearby attractions include the Linnaeushof, Museum de Cruquius, and a covered swimming pool approximately 150 meters from the docks. The association also operates a second harbor, Spaarneborghhaven, a short distance away.