Andrew John Julian Bartlett (born 4 August 1964) is an Australian politician, academic, and social campaigner who served as a Senator for Queensland from 1997 to 2008 and from 2017 to 2018. He represented the Australian Democrats in his first stint in the Senate, including as party leader from 2002 to 2004 and deputy leader from 2004 to 2008. In November 2017, he returned to the Senate as a member of the Australian Greens, replacing Larissa Waters after her disqualification during the parliamentary eligibility crisis. He resigned in August 2018 to allow Waters to return.