Jim Mullen (born 26 November 1945) is a Glasgow-born jazz guitarist with a distinctive style, like Wes Montgomery before him, picking with the thumb rather than a plectrum.

It was while both musicians were touring the United States with AWB in the mid-70s that Mullen met tenor saxophone player Dick Morrissey, and throughout the 1980s, he found critical notice as joint leader of the British jazz funk band Morrissey–Mullen. Record producer Richard Niles, who produced the band’s sixth album, It’s About Time, later produced three solo albums for Mullen.

Mullen has also played and recorded with, among others, Mose Allison, Hamish Stuart, Joanna Eden, Tam White, Claire Martin, Mike Carr, Jimmy Witherspoon, Dave O’Higgins and Georgie Fame, Sinan Alimanović, David Tughan and Frank Holder. Mullen has recorded as part of The AllStars, a collective of session musicians on their Paul McCartney-produced album All About the Music, alongside special guests Jocelyn Brown, Hamish Stuart and Angelo Starr.