Legal Weapon are a Southern California punk band, initially composed of singer Kat Arthur, guitarist Brian Hansen, drummer Charlie Vartanian, bassist Patricia Morrison (formerly of The Bags and later of The Gun Club, The Sisters of Mercy and The Damned) and guitarist Mike R. Livingston.

The band's early full-length albums Death of Innocence (on which their lineup included Steve Soto and Frank Agnew of The Adolescents) and Your Weapon were well received; its later efforts less so. With her powerful voice, Kat Arthur is often called "the Janis Joplin of punk".