Celebrity Big Brother 17 was the seventeenth series of the British reality television series Celebrity Big Brother, hosted by Emma Willis and narrated by Marcus Bentley. The series launched on 5 January 2016 on Channel 5 in the United Kingdom and TV3 in the Republic of Ireland, and concluded 32 days later on 5 February 2016, making it the longest celebrity series to date, along with Celebrity Big Brother 19. It was the tenth celebrity series and the fifteenth series of Big Brother overall to air on Channel 5. First details of the series were released on 7 December 2015 when the new eye was released, and a new "vaudeville theatre" theme also being confirmed.
With sixteen celebrities, this series had the most housemates since the show began in 2001. However this is now held by Celebrity Big Brother 19 with eighteen. With three voluntary exits from Angie Bowie, David Gest and Jonathan Cheban, this series equalled the record with series 5 in 2007, which also had three housemates walk from the house. On 5 February 2016, the series was won by Scotty T, with Stephanie Davis finishing as runner-up.
Celebrity Big Brother 17 had no sponsorship, making it the first series of either Big Brother and Celebrity Big Brother not to have a sponsor since Celebrity Big Brother 1 in 2001.