Big Brother (British TV series) series 20

Big Brother 2023, also known as Big Brother 20, was the twentieth series of Big Brother to air in the United Kingdom. It is the first series to air on ITV2 after ITV gained the rights to the series in August 2022, almost four years since it last aired on Channel 5. The series began on 8 October 2023, with a launch show airing simultaneously on both ITV (ITV1 and STV) and ITV2, with the remainder of the series broadcasting primarily on the latter channel. It is co-presented by AJ Odudu and Will Best, who also front the companion show, Big Brother: Late & Live.

On 17 November 2023, Jordan Sangha was announced as the winner of the series, beating Olivia Young who finished as runner-up. At 42 days, this was the shortest-running regular series of Big Brother in the UK, surpassing the seventeenth series, which lasted 50 days. This was surpassed by the succeeding series, which ran one day shorter.