Gerald Simpson (born 16 February 1967, Moss Side, Manchester, England), better known as A Guy Called Gerald, is a British DJ, record producer and musician.

He is best known for his early work in the Manchester acid house scene in the late 1980s and the track "Voodoo Ray". At that time, he specialised in techno music produced using equipment such as the Roland TB-303 bass synthesiser and the TR-808 drum machine. His style developed during the early 1990s, and his 1995 album Black Secret Technology would become a "much-touted candidate for 'best jungle album ever.'"

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