Big Brother is the German version of the international reality television franchise Big Brother created by producer John de Mol Jr. in 1997. Following the premise of other versions of the format, the show followed a number of contestants, known as housemates, who are isolated from the outside world for an extended period of time in a custom-built house. Each week, one of the housemates is evicted by a public vote, with the last housemate remaining winning a cash prize.

Big Brother premiered on 28 February 2000 and ran for eleven seasons on RTL Zwei (formerly spelled RTL 2 and RTL II) before the network cancelled it in September 2011. Big Brother returned on 22 September 2015 on sixx, and lasted for one season. After a 5-year break, Sat.1 rebooted the series on 10 February 2020. Three years later, in October 2023, it was announced by EndemolShine Germany and Sat.1 that Big Brother would return for his fourteenth season on 2024.

The show also featured a 24-hour live feed, in which fans could view the inside of the house at any time on the German pay channel Premiere and Sky until the twelfth season. In the Sat.1 iteration of the show, however, there was no 24-hour live stream offered from the inside of the house.

After a two-year hiatus, the show was bought and revamped by Sat.1 as Promi Big Brother, the first celebrity version of the German version, with the first season premiering on 13 September 2013. Cindy aus Marzahn and Oliver Pocher were announced as the new presenters of the revived show in August 2013. Jochen Schropp is hosting the show since season 2, and with Jochen Bendel, also hosted Series 5. Since season 6, Schropp and Marlene Lufen are hosting the show together.