Gareth Peirce (born Jean Margaret Webb; March 1940) is a British solicitor and human rights activist. She has worked on a number of high-profile cases involving allegations of human rights injustices. Her work with Gerry Conlon and the Guildford Four – wrongly convicted of bombings carried out by the Provisional Irish Republican Army – was chronicled in the film In the Name of the Father (1993), in which she was portrayed by Emma Thompson.