Jachthaven De Steur is a marina located on the Steurgat in Werkendam, Noord-Brabant, just south of the Biesboschsluis and on the edge of Nationaal Park De Biesbosch.

The marina accommodates up to 135 boats, with berths and boxes for vessels up to 15 meters in length, plus a handful of larger moorings at the pier heads. Pontoons are equipped with shore power and water points, and the site has toilets and showers.

The location offers excellent onward access in two directions: heading north takes you onto the Nieuwe Merwede toward the historic towns of Gorinchem and Woudrichem, while heading south out of the Steurgat puts you directly into the waterways of the Biesbosch.

Café De Steur, serving food and drinks, is situated close to the marina.