Marti Webb (1944 - ) is a musical actress from the UK, who appeared on stage in Evita, before starring in Andrew Lloyd Webber's one woman show Tell Me On A Sunday in the mid 1980s. She had a hit in the UK charts with a song from the show, "Take That Look Off Your Face".

Webb first came to prominence as Ann in the original London production of 'Half a Sixpence' opposite Tommy Steele. She later dubbed the singing voice of Julia Foster, who played the role in the film adaptation.

She sang a cover version of Michael Jackson's "Ben" in memory of a child, Ben Hardwicke , discussed on the BBC television programme That's Life.

Webb co-devised and starred in 'The Magic of the Musicals', a concert tour featuring songs from musical theatre in the early 1990s. The album of the show was co-produced by Webb's husband, sound engineer Tom Button.

During 1995 and 1996 Webb reprised her role in a UK tour of Evita.

She recently appeared in the new London stage show of Thoroughly Modern Millie (2003) before reprising her role in Tell Me On A Sunday both in the West End and on tour.

Webb's albums comprise: Tell Me on a Sunday (1980) Won't Change Places (1981) Encore (1985) Always There (1986) Gershwin (1987) Performance (1989) Evita (1995) Gershwin: The Love Songs (1998) Limelight (2003)