Celebrity Big Brother 20 was the twentieth series of the British reality television series Celebrity Big Brother, hosted by Emma Willis and narrated by Marcus Bentley. The series launched on 1 August 2017, and concluded on 25 August 2017 after 25 days, making this the shortest series since Celebrity Big Brother 12 in 2013. The series was on Channel 5 in the United Kingdom and 3e in Ireland with the spin-off show Celebrity Big Brother's Bit on the Side presented by Rylan Clark-Neal. It was the thirteenth celebrity series and twentieth series of Big Brother overall to air on Channel 5.