Michael William "Mick" Gallagher (born 29 October 1945 in Fenham, Newcastle upon Tyne, England) is a British Hammond organ player and best known as a member of Ian Dury and the Blockheads and for his contributions to albums by the Clash. He has also written music for films such as Extremes (1971) and After Midnight (1990), also the Broadway play Serious Money (1988).
Mick Gallagher started his musical career with The Unknowns. He played with the Animals during 1965, replacing founding member Alan Price. He moved on to form The Chosen Few, where he played alongside Alan Hull, who later formed Lindisfarne. Other associations include Skip Bifferty, Peter Frampton's Camel and Cochise.
His Hammond sound was a major contribution to Ian Dury and The Blockheads. He played on two of the most influential Clash albums, London Calling (1979) and Sandinista! (1980), and made live appearances with the band, also playing on their last album Cut the Crap (1985), for which he never received a credit.
Gallagher worked with Clash drummer Topper Headon again when they recorded Headon's Waking Up (1986), appearing with Bobby Tench and Jimmy Helms. He has also performed and recorded with Paul McCartney, Robbie Williams, Dave Stewart and Annie Lennox. More recently he returned to perform with The Blockheads and John Steel's The Animals and Friends.