Percy Jones (born 3 December 1947) is a Welsh bass guitarist known as a member of the jazz fusion ensemble Brand X, from 1974-1980, and 1992-1999.

Jones, who was born near Llandrindod Wells, has also done extensive work as a session musician, and has been active with other groups. He played with a New York City trio called Stone Tiger (featuring guitarist Bill Frisell and drummers Mike Clark and Dougie Bowne during different periods) in 1982/83 Jones was also the driving force behind Tunnels, an improvisation collective which released four albums including Progressivity and Live From The Knitting Factory. Residing in New York, he currently is a member of MJ12, an instrumental group based in NYC.

Jones was also a member of the jazz fusion group Soft Machine, the poetry rock group The Liverpool Scene (featuring poet Adrian Henri), and has contributed to recordings by Kate Bush, David Sylvian, Brian Eno, Steve Hackett, Paranoise, Suzanne Vega, Richard Barbieri and Fovea Hex, amongst others.

He released a solo album, Cape Catastrophe in 1990.