Maximum the Hormone (Japanese: マキシマムザホルモン, Hepburn: Makishimamu za Horumon) is a Japanese heavy metal/hardcore punk band from Hachiōji, Tokyo. Their lineup consists of vocalist Daisuke-han, drummer Nao, guitarist Maximum the Ryokun, and bassist Ue-chang. Each member alternates singing lead vocals, often within the same song, with the exception of Ue-chang, who provides backup vocals almost exclusively.

The group is best known for their unconventional and experimental style of alternative metal music. Over their career, they have found success incorporating elements of heavy metal, hardcore punk, hip hop, pop, funk, and ska into their sound. Stylistically, their music runs the gamut from being dark and serious, to ironic or humorous, often with drastic shifts in tempo and mood over the course of a song. The band's eclectic nature frequently draws comparisons to System of a Down.