Letná Water Tower, Water tower in Bubeneč, Prague, Czech Republic

Letná Water Tower is a 38.3-metre, five-storey neo-Renaissance water tower built in 1887–1888 to the design of architect and city engineer Jindřich Fialka. Its tent roof carries dormers and a clock mechanism in a top structure, and the uppermost floor has an external gallery on corbels.

Built in 1887–1888 to a design by architect and city engineer Jindřich Fialka, the tower and adjacent pumping station supplied water to parts of Holešovice and Bubeneč until 1913. It was then converted into housing, while the engine room and reservoir were later demolished in the 1980s. A renovation by Petr Hájek architekti followed between 2016 and 2018.

The tower's name survives in the lane "U letenské vodárny" between the Molochov block and the tower. Since the 2016–2018 renovation the former tank floor holds a hall with an outdoor gallery reached on corbels, and a periscope was added there.

The tower stands at Korunovační 1000/3 in Bubeneč, next to the Sparta Prague stadium. The social hall and the outdoor gallery on corbels are on the top floor, reached by stairs; the library is one level below. The alley beside the tower still bears the name "U letenské vodárny".

The tower's top-floor hall, once the water tank, opens onto an outer gallery on corbels; a periscope was added there during the 2016–2018 renovation. The clockwork sits in a housing at the tip of the tent roof, above dormers.