Mark John ("MJ") Hibbett (born 19 June 1970) is an English guitarist singer-songwriter, often compared to Billy Bragg and Richard Digance.

With his band The Validators, Hibbett come to widespread online notice in 2000 with "Hey Hey 16K", an ode to the ZX Spectrum and other home microcomputers of the 1980s. The song gained larger acclaim when an animated music video for the track, created by Rob Manuel, was released in 2004. Hibbett later collaborated with Manuel, who directed the music video for his song "The Gay Train".