Planetarium České Budějovice, Astronomical observatory and planetarium in Háječek, České Budějovice, Czech Republic

Planetarium České Budějovice is an astronomical facility on Zátkovo nábřeží in the Háječek park, at the confluence of the Vltava and Malše rivers. Its planetarium hall has a dome 8.5 metres across with 48 seats, and the building's façade carries a sgraffito of the solar system by Jan Halla. The observatory dome holds telescopes used during guided tours.

The Jihočeská astronomická společnost was founded in 1928 with Dr. Karel Vodička as its first chairman, aiming to build an observatory for popularising astronomy. After a public collection supported by the state and the city, the building opened in 1937, making it the second oldest observatory open to the public in Bohemia. Until the 1950s it had no paid staff; amateur members organised screenings, lectures and observations.

The observatory runs programmes for schools from nursery to university level, and guided tours include the telescope dome and a planetarium showing a simulated night sky. Lectures are often paired with film screenings, children get worksheets, and the planetarium hall regularly hosts exhibitions on astronomy and natural science, including animal photographs taken through the window of the Kleť observatory.

The facility is best visited on clear nights when outdoor observation works well. It's helpful to plan your visit around scheduled programs, which combine indoor cinema presentations with opportunities to look through the available telescopes.

The observatory's Kleť branch, at 1,070 m the highest in Czechia, had discovered over 1,703 asteroids by 7 May 2016. Its thousandth find, announced in 2003, was named Boiohaemum in 2013. Near the summit stands a sundial designed in 1974 by architect Petr Pešek.