Big Brother (season 9)

Big Brother 9, also known as Big Brother: 'Til Death Do You Part, was the ninth season of the American reality television series Big Brother. It is based upon the Netherlands series of the same name, which gained notoriety in 1999 and 2000. Big Brother 9 is the first season of the series to air in the Winter time period, due to a writer's strike. The series premiered on CBS on February 12, 2008 and lasted eleven weeks until the live finale on April 27, 2008. Big Brother 9 was the first season to cast a total of 16 HouseGuests, in which it became a permanent change to the format in season fourteen and subsequent seasons. The series ended after 81 days.

The winner of this season was Ryan Wehrle.

This season was preceded by season eight and followed by season ten.