Thomas Muir (24 August 1765 – 26 January 1799), also known as Thomas Muir the Younger of Huntershill, was a Scottish political reformer and lawyer. Muir graduated from Edinburgh University and was admitted to the Faculty of Advocates in 1787, aged 22. Muir was a leader of the Society of the Friends of the People.He was the most important of the group of two Scotsmen and three Englishmen on the Political Martyrs' Monument, Edinburgh (the others being Thomas Fyshe Palmer, William Skirving, Maurice Margarot and Joseph Gerrald). In 1793 they were sentenced to transportation to Botany Bay Australia for sedition.