Big Brother is the Australian version of the international Big Brother reality television series. Big Brother was produced from 2001 and ran for eight seasons on Network Ten before the network cancelled it in July 2008 after experiencing audience erosion and controversy. Big Brother returned on 13 August 2012 with a ninth season on the Nine Network with repeats on GO!. The tenth season aired on Nine from 29 July 2013 to 6 November 2013 and the eleventh and final season ran 8 September 2014 to 26 November 2014. All eleven seasons were produced by Endemol Southern Star.
From its first season until its seventh season in 2007 the show was hosted by Gretel Killeen. With a revamp of the series in 2008 she was replaced by radio duo Kyle Sandilands and Jackie O. From 2012 to 2014 it was hosted by Sonia Kruger. Mike Goldman has narrated all eleven seasons of the series.
Between 2001 and 2005 Big Brother Australia was also shown in New Zealand on TV2 and Prime. The show returned to New Zealand, as part of the TV3 summer line-up in November 2013. Series 10 ended in March 2014. Series 11 aired in New Zealand starting 3 November 2014.