Big Brother 10 (UK)

Big Brother 2009, also known as Big Brother 10, was the tenth series of the British reality television series Big Brother. The show followed a total of twenty-one contestants, who were isolated from the outside world for an extended period of time in a custom built House. Each week, one or more of the housemates were evicted by a public vote. The last remaining housemate won a cash prize of £71,320.

The series launched on Channel 4 on 4 June 2009 and ended on 4 September 2009, lasting 93 days - the joint-second longest British edition of Big Brother to date. Davina McCall returned as presenter for her tenth consecutive year. Sixteen housemates entered on launch night.

The winner of this series was Martha Hornyak.

This series was preceded by series nine and followed by series eleven.