Big Brother 23 is the twenty-third season of the American reality television program Big Brother. The season premiered on July 7, 2021, with a live move-in on CBS in the United States and Global in Canada. The show chronicles a group of contestants (known as HouseGuests) living in a house together while being constantly filmed and having no communication with the outside world as they compete to be the last competitor remaining to win a grand prize of $750,000 (an increase of $250,000 from past editions of the show). CBS renewed Big Brother for an additional season on October 28, 2020, the day the previous season concluded. On the same day, Julie Chen Moonves was confirmed to return as host.