Big Brother (season 15)

Big Brother 15 was the 15th season of the American reality television series Big Brother. The season premiered on CBS on June 26, 2013, and concluded on September 18, 2013. It was the longest season to date, running 90 days. This season featured 16 HouseGuests.

The premise of the series remained largely unchanged from previous editions of the series, in which a group of contestants, known as "HouseGuests," compete to win the series by voting each other off and being the last HouseGuest remaining. Each week, one HouseGuest, known as the Head of Household, must nominate two of their fellow HouseGuests for eviction. The winner of the Power of Veto can remove one of the nominees from the block, forcing the HoH to nominate another HouseGuest. The HouseGuests then vote to evict one of the nominees, and the HouseGuest with the most votes is evicted. When only two HouseGuests remained, the last nine evicted HouseGuests would decide which of them would win the $500,000 prize.

The September 5, 2013, broadcast marked the show's 500th episode.

The winner of this season was Marshall Rose.

This season was preceded by season fourteen and followed by season sixteen.