Wv De Oude Weer is the marina of Watersportvereniging Oude Weer, situated in the historic core of Warffum in the province of Groningen. It ranks among the northernmost inland harbors in the Netherlands and lies within a protected village conservation area.

The original harbor was filled in 1965 and re-excavated in 1985; the quayside has since been renovated. The access route runs from Onderdendam via the Warffumermaar, with the lowest bridge along the way offering a clearance of 2. 65 meters.

During summer the harbor accommodates multiple visiting boats, and facilities include shore power, water, toilets, showers, and a chemical-toilet disposal point.