Eva Ortiz, known professionally as Eva O, is an American singer, songwriter, guitarist, and video artist. A pioneer of the Los Angeles deathrock scene, she founded the all-female punk band Speed Queens in the late 1970s and the seminal deathrock trio Super Heroines in 1981. She provided backing vocals on Christian Death's influential 1982 debut Only Theatre of Pain and later contributed to reunion lineups. In 1987, she co-founded Shadow Project with her then-husband Rozz Williams of Christian Death.