Legion of Mary was an American rock band, formed by Jerry Garcia of the Grateful Dead and his friend and musical collaborator Merl Saunders. The band existed from July 1974 to July 1975, and played about 60 live shows. Its members were Garcia, Saunders, John Kahn, Martin Fierro and Ron Tutt (drums). The previous lineup of the band, with Paul Humphrey on drums, is sometimes also referred to as Legion of Mary, but later research has shown that they did not use the Legion of Mary name.