Peter Tatchell (b.1952) is a human rights campaigner best known for his LGBTQ rights advocacy. Tatchell was born in Melbourne, Australia, and emigrated to London in 1972, where he quickly became involved with the Gay Liberation Front (GLF). In 1973 he was the GLF's delegate to the World Festival of Youth and Students in East Berlin, where he distributed leaflets in support of gay liberation inside the German Democratic Republic. In 1986 Tatchell published a self-help book, AIDS: A Guide to Survival and was a founding member of the UK AIDS Vigil Organisation and the UK chapter of ACT UP (the AIDS Coalition to Unleash Power).

In May 1990, he was one of the founding members of the campaign group OutRage!, who became well-known for a number of campaigns and non-violent direct-action protests undertaken to oppose discrimination against gays and lesbians in the United Kingdom. The organisation ceased operations in 2011 after 21 years.

In 2011 he founded The Peter Tatchell Foundation, a non-profit whose work seeks to promote and protect human rights in the UK and internationally.

In addition to his campaign work, Tatchell fought a number of parliamentary campaigns. In 1983 he ran as the Labour Party's candidate in the Bermondsey constituency by-election, in 2000 he was an independent candidate for the Greater London Assembly, and in 2007 he was the Green Party's candidate for Oxford East.