Celebrity Big Brother 18 was the eighteenth series of the British reality television series Celebrity Big Brother, hosted by Emma Willis and narrated by Marcus Bentley. The series launched on 28 July 2016, just two days after the conclusion of Big Brother 17 on Channel 5 in the United Kingdom and TV3 in Ireland. The series ended on 26 August 2016, making it the longest summer series to date and the third-longest series of Celebrity Big Brother in its history, behind series 15 and 17, respectively. Rylan Clark-Neal continued to present the spin-off show Celebrity Big Brother's Bit on the Side. It was the eleventh celebrity series and the seventeenth series of Big Brother overall to air on Channel 5.
On 26 August 2016, the series was won by Stephen Bear with Ricky Norwood finishing as runner-up.