Guy Pratt (born 3 January 1962) is a British musician and comedian.
Pratt's music career spans more than 30 years. He is best known for his prolific work as a session bass player, working with artists including Pink Floyd (also David Gilmour and Nick Mason), Roxy Music (also Bryan Ferry), Gary Moore, Madonna, Michael Jackson, The Smiths, Robert Palmer, Echo & the Bunnymen, Tears for Fears, Icehouse, Bananarama, Iggy Pop, Tom Jones, Debbie Harry, Whitesnake, Womack & Womack, Kirsty MacColl, Coverdale•Page, Lemon Jelly, The Orb, All Saints, Stephen Duffy, Robbie Robertson, and A. R. Rahman. In addition to his work as a session musician, Pratt has been a member of the Australian rock band Icehouse, and is currently a member of the psychedelic rock band Nick Mason's Saucerful of Secrets with Gary Kemp of Spandau Ballet.
Pratt has also been an actor and worked on TV and film soundtracks, including Dick Tracy (1990), Last Action Hero (1993), Hackers (1995), Still Crazy (1998) and Johnny English Reborn (2011). In 2005 he debuted a one-man music and comedy show.