Martin Stewart Simpson (born 5 May 1953) is an English folk singer, guitarist and songwriter. His music reflects a wide variety of influences and styles, rooted in Britain, Ireland, America and beyond. He builds a purposeful, often upbeat voice on a spare picking style.

According to his discography, Simpson has appeared solo (21 albums), as a session musician (16 albums), in collaboration (9 albums), in compilations, live, and on performance and instructional DVDs (7). He has also published a book. Between 2002 and 2010, he was awarded multiple honours among the BBC Radio 2 Folk Awards.