Jachthaven De Oude Potmarge is a cooperative, members-only marina located at Holstmeerweg 10 in Leeuwarden, Friesland. It sits directly on the Potmarge canal, a sheltered side-water connected to Leeuwarden's inner canal network.

The marina is managed by a local cooperative association and comprises 102 boat houses (schiphuizen) of varying sizes, each equipped with its own electrical metering and water hookup.

Membership fees cover operating costs including maintenance, insurance, and property taxes. The marina does not offer visitor or overnight berths — access is strictly reserved for members.