Peter Taaffe (born April 1942) is a British Marxist Trotskyist political activist and former leader of the Socialist Party.

Taaffe was expelled from the Labour Party in 1983, along with four other members of Militant's editorial board.

[4][5][6] Taaffe was influential in the policy decisions of Liverpool City Council of 1983–1987, according to the council's deputy leader Derek Hatton,[7] and in the formation of the Militant tendency's policy regarding the Poll Tax in 1988–1991.

[8] Taaffe was born in Birkenhead, Cheshire, one of six children of a sheet metal worker.

[6] In the four-year Liverpool struggle, Taaffe was closely involved with developments, discussing with close friends and leading Liverpool Militant supporters, such as the former print worker Tony Mulhearn.