Celebrity Big Brother, also known as Big Brother: Celebrity Edition, is a reality television spin-off series of the American adaptation of Big Brother created by John de Mol. The series began on February 7, 2018 on CBS in the United States and is simulcast in Canada on Global. The series is filmed at CBS Studio Center in sound stage eighteen located in Studio City, Los Angeles. Julie Chen Moonves reprises her role as host from Big Brother with Allison Grodner and Rich Meehan also returning as executive producers. The series is produced by Fly on the Wall Entertainment in association with Endemol Shine North America.

The premise of the series remained largely unchanged from the main edition of Big Brother, in which a group of contestants, known as "HouseGuests,"

who live in a purpose-built house, known as the Big Brother House, with no contact from the outside world. The contestants compete in competitions for safety and for power over the household before voting each other out in an attempt to be the last HouseGuest remaining and win a grand prize. The difference from the parent series is the inclusion of "Celebrity" HouseGuests (those with notoriety prior to participating in the series), the time frame (a month as opposed to 3 months) and a smaller grand prize ($250,000 as opposed to $750,000)

Each season is also transmitted in real-time which allows for greater viewer participation in the form of America's Vote where the public can give their favorite HouseGuest various prizes ranging from luxury items to advantage to help them survive inside the House. Prior to the live season finale, the viewers are able to vote for their America's Favorite HouseGuest with the winner getting an auxiliary prize of $25,000.

The first overall season of Celebrity Big Brother worldwide premiered in the United Kingdom in 2001 while an American version of the format has been speculated since 2002. The first season of the American adaptation was announced during a live double eviction episode of the nineteenth regular season on September 7, 2017 by Julie Chen. The first season was scheduled during the February 2018 sweeps period to counterprogram NBC's coverage of the 2018 Winter Olympics. The series premiere was the number one program for CBS attracting 7.27 million viewers and the highest-rated season premiere since Big Brother 13. The program was often covered in the media due to the inclusion of Omarosa Manigault and her political revelations in the first season.

In September 2021, CBS renewed Celebrity Big Brother for a third season, which premiered on February 2, 2022.