Vienna Zeiss Planetarium, Planetarium in Leopoldstadt, Vienna, Austria.

The Vienna Zeiss Planetarium is a domed building in Prater park, Leopoldstadt, where a Zeiss projector displays the night sky on a curved ceiling overhead. The hall is arranged with rows of reclining seats all angled upward toward the dome.

The planetarium opened in 1964 in the Prater, replacing an earlier facility that had been established in the 1920s. The Zeiss projector has been updated several times over the decades, most recently with digital technology.

The forecourt is named Oswald-Thomas-Platz after Oswald Thomas, director of Vienna's first two planetariums. Since 2014 the planetarium has coordinated the "Science" programme of the Vienna adult education centres, with about 200 lectures and events per semester and over 10,000 visitors a year. Director Michael Feuchtinger, in office since March 2022, added concerts and poetry slams under the starry sky.

The planetarium sits inside the Prater park and is easy to reach by metro, with Praterstern station nearby. Booking in advance is a good idea, as shows can fill up quickly, especially on weekends.

The projector can recreate the sky as it appeared from any point on Earth at any moment in history, including thousands of years into the past or future. This means a single show can take visitors from ancient Egypt to the far future without leaving their seats.