Robert James Brown is an Australian former politician, medical doctor and environmentalist. He was a senator and the parliamentary leader of the Australian Greens. Brown was elected to the Australian Senate on the Tasmanian Greens ticket, joining with sitting Greens Western Australia senator Dee Margetts to form the first group of Australian Greens senators following the 1996 federal election. He was re-elected in 2001 and in 2007. He was the first openly gay member of the Parliament of Australia and the first openly gay leader of an Australian political party.

The Australian Greens, commonly referred to simply as the Greens, are a confederation of green state and territory political parties in Australia. As of the 2022 federal election, the Greens are the third largest political party in Australia by vote and the fourth-largest by elected representation. The leader of the party is Adam Bandt, with Mehreen Faruqi serving as deputy leader. Larissa Waters currently holds the role of Senate leader.