Водна кула в Лозенец, Water tower in Lozenets district, Sofia, Bulgaria.

The water tower in Lozenets is a 27-meter reinforced-concrete and brick structure designed by Franz Salbach, with a 100-cubic-meter reservoir set 15 meters above the 610.40-meter terrain. A massive hexagonal column runs through the tower as a central axis, supporting an internal metal spiral staircase with several landings, lit by windows with metal frames. The top terrace has a metal railing and is reached through a heavy metal door with a window; the entire facade is overgrown with ivy.

Designed by German hydraulic engineer Franz Salbach, the structure was built between September 1928 and November 1929 to serve the rapidly growing population of Sofia. It reflected the modern engineering approaches of that era and supported the capital's infrastructure development.

The tower gave its name to the Vodna Kula Art Fest, a contemporary art festival that has held installations and exhibitions inside the building since 2006. In 2022 the tower was granted the status of a single immovable cultural asset. Its whole facade is overgrown with ivy.

The tower stands in the Lozenets neighbourhood garden bounded by Galichitsa, Plachkovitsa and Sveti Teodosiy Tarnovski streets and James Bourchier Boulevard. Its terrace is reached by an internal metal spiral staircase lit by metal-framed windows. The 360-degree panorama once seen from the top is now largely blocked by surrounding high buildings.

The tower's reservoir sits 15 m above the highest ground point at 610.40 m, and the structure reaches 27 m. Its facade is entirely overgrown with ivy. Since 2006, the Water Tower Art Fest has held installations and exhibitions inside, taking its name from the building.