Wasserturm Forst, Water tower in Forst, Germany.

Wasserturm Forst is a water tower south of Forst's centre, at the Triebeler Straße roundabout. Its brick shaft carries a bulging granite ring that supports an iron frame holding a 13-metre-wide elevated tank, 8 metres high outside and 9.19 metres at its centre, with a capacity of 1000 m³. A narrow maintenance walkway circles the tank, and the spire and roof are a wrought-iron construction.

Forst decided in 1901 to build a waterworks with a tower, and the first sod was turned on 1 May 1902; master mason Lüdecke carried out the work to a design by engineer Ernst Prinz. The tank follows Otto Intze's construction principle, and regular water supply began on 1 September 1903. Repairs under the GDR were minimal, and the tower was taken out of service in December 2021 because its open tank affected water quality.

Locals call the tower "Unser Dicker" (Our Fat One), a nickname that has stuck since the early days of the water supply. The tower is the town's landmark, and its silhouette is used as a symbol of Forst. The waterworks began operating on 1 September 1903.

The tower stands at the roundabout on Triebeler Straße, south of Forst's town centre, so it is reached by road rather than on foot from the centre. It is a listed monument, and the site is a traffic circle, so visitors view it from the roadside. The tower has been out of service since December 2021.

During the 1990–1994 restoration the tank's brick casing was dismantled down to the granite ring and rebuilt to keep its outer appearance, and the spire with its cap was lifted off whole by a large crane, repaired on the ground and set back on top.