Celebrity Big Brother 2007, also known as Celebrity Big Brother 5, was the highly controversial fifth series of the British reality television series Celebrity Big Brother, a spin-off of Big Brother. The series was broadcast on Channel 4 in the UK (also on S4C in Wales), and involved a number of celebrities, referred to as 'housemates', who live in the Big Brother House with no contact with the outside world. In recent series, the show's producers have offered celebrities money to appear on Celebrity Big Brother. The series launched on 3 January 2007 and ran for 26 days. The launch show peaked at 8.2 million viewers, making it the second most-watched launch in Big Brother history. It was the first Celebrity Big Brother series to be shown in the 16:9 widescreen format.

On 16 January 2007, this series had attracted the largest ever number of public complaints to the UK broadcasting watchdog Ofcom about a Big Brother series. The complaints received detailed concerns that housemate Shilpa Shetty had been subjected to bullying, allegedly with undertones of racism. As an example, Danielle Lloyd called Shilpa "a dog" and that she should "fuck off home". This sparked widespread anger and demonstrations in India, where the alleged racism was reported on the news, and led Big Brother's main sponsor Carphone Warehouse to suspend its sponsorship of the show. As of 19 January 2007, a Channel 4 spokesman agreed that participants should be made aware of the controversy, probably explaining the recent explanations and apologies tendered by the housemates and their complete lack of surprise after learning about the latest eviction. One event in this series was a technical fault that affected voting lines in the eviction between Dirk Benedict, Jo O'Meara, Ian Watkins, Cleo Rocos and Shilpa Shetty all the people who voted were offered a refund. Any unclaimed money would be donated to charity.

Big Brother 5 was the fifth series of Big Brother UK, a reality television show shown on Channel 4 in which a number of contestants live in an isolated house trying to avoid being evicted by the public with the aim of winning a large cash prize at the end of the run. Due to the poor reaction to the previous series, the theme for this year's series was "Big Brother Turns Evil", in which the housemates were subject to a more cruel environment. It launched on Channel 4 on the same night the last episode of Friends aired, and the day was promoted as 'Black Friday'. The series began on 28 May 2004, and ended on 6 August in the same year and was the second most watched series of Big Brother in the UK (the first being Big Brother 3), averaging 5.1 million viewers.

Nadia Almada returned for Ultimate Big Brother and entered on Day 1. Michelle Bass and Victor Ebuwa later joined the House on Day 4. Nadia and Michelle became the third and fourth evicted housemates respectively but Victor made the final and achieved fourth place.

Celebrity Big Brother could refer to:

Celebrity Big Brother 2007, also known as Celebrity Big Brother 5, was the highly controversial fifth series of the British reality television series Celebrity Big Brother. The series was broadcast on Channel 4 in the UK (also on S4C in Wales), and involved a number of celebrities, referred to as 'housemates', who live in the Big Brother House with no contact with the outside world. The series saw the return of Jade Goody, who became a celebrity after appearing on the third regular series of Big Brother in 2002, arriving with her boyfriend and mother, it was the first series where family members could enter the house together.

The series launched on 3 January 2007 and ran for 26 days, ending on 29 January 2007. The launch show peaked at 8.2 million viewers, making it the second most-watched launch in Big Brother history. As in earlier series, Davina McCall presented the main Channel 4 show. Dermot O'Leary presented Celebrity Big Brother's Little Brother and Celebrity Big Brother's Big Brain. Russell Brand presented Celebrity Big Brother's Big Mouth, this would be Brand's last appearance as presenter. Celebrity Big Brother Diary Room Uncut, and live streaming also returned on the Official Channel 4 website and also on E4 at selected times. It was the first Celebrity Big Brother series to be shown in the 16:9 widescreen format.

Big Brother 5 may refer to: