Anthony Philip Harford (born 19 April 1957), better known by his stage name Tony Martin, is a heavy metal vocalist best known for his work with Black Sabbath from 1987 to 1990 and again from 1993 to 1997. Martin was the band's second longest serving vocalist after Ozzy Osbourne. He has since been involved in many other projects (such as M3, Misha Calvin, The Cage, Giuntini Project, and Phenomena ("Psychofantasy" album)).

Despite performing almost exclusively as a vocalist, Martin is a multi-instrumentalist, stating in an interview that he plays guitar, bass, drums, violin, keyboards, harmonica, bagpipes, and pan pipes. On his 2005 solo album Scream, Martin performed vocals, bass, drums, violin and additional guitar parts.