Prospect Park Water Tower, Water tower in Prospect Park neighborhood, Minneapolis, United States

The Prospect Park Water Tower is a concrete water tower with an open-air belvedere and a steeply pitched roof of green ceramic tile, giving it the nickname Witch's Hat. Built in 1913–1914, it stands on Tower Hill Park, one of the highest points in the Twin Cities, and overlooks a small pump house and tennis courts.

Built in 1913–1914 on Tower Hill, the tower raised water pressure for local firefighting. It stopped working as a water tower in 1952. After a lightning strike in 1955 brought demolition plans, neighbors, spurred by eleven Prospect Park Blue Birds, saved it. The park and tower were listed on the National Register of Historic Places in 1997.

Locals call it the Witch's Hat for its brimmed green ceramic tile roof. In 1955, when the city planned demolition after a lightning strike, eleven Prospect Park Blue Birds, a junior Campfire Girls group, helped rally neighbors to save it. The observation deck now opens only one day a year, celebrated with an ice-cream social.

The tower is visible from the park grounds and can be viewed from various angles throughout Tower Hill Park. Daytime visits work best for seeing the details and appreciating its position in the landscape.

The tower is said to have inspired Bob Dylan's "All Along the Watchtower", since it was clearly visible from his home in nearby Dinkytown. Its observation deck opened only one day a year, celebrated with an ice-cream social, until a step on the internal staircase broke during Doors Open Minneapolis in 2019; it has stayed closed since.