Big Brother (season 5)

Big Brother 5 was the fifth 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. The series premiered on CBS on July 6, 2004 and lasted eleven weeks until the live finale on September 21, 2004. This season was the first to be accompanied by the House Calls: The Big Brother Talk Show spin-off series, which was viewable online and discussed the events of the game. The fifth season continued to have the ratings success of the previous season, averaging more than eight million viewers per episode. The Big Brother 5 premiere garnered 9.55 million viewers, almost matching that of the previous season's launch night. Ratings stayed gradually the same, with the finale receiving more than 10 million viewers.

The winner of this season was Matthew Pulsifer.

This season was preceded by season four and followed by season six.