Gary Willis (b. 28 March 1957) is an American bassist and composer known foremost as the co-founder (with Scott Henderson) of the jazz fusion band Tribal Tech. Aside from his work in Tribal Tech, Willis has worked with numerous other jazz musicians including Wayne Shorter, Dennis Chambers, and Allan Holdsworth. "Slaughterhouse 3", released in 2006, continued his collaboration with drummer Kirk Covington as well as saxophonist Llibert Fortuny to form a modern jazz/funk/groove power-trio. Willis's latest solo CD "Actual Fiction" was released on the Abstractlogix label in 2007.

In addition to "Actual Fiction", Willis's solo career includes No Sweat from 1996 and Bent in 1998. Willis is also the author of four books for bass guitar, "Fingerboard Harmony for Bass", "The Gary Willis Collection", "Ultimate Ear Training for Guitar and Bass" and "101 Bass Tips" all published by Hal Leonard.