Ultraviolence is a British gabber act headed by Johnny Violent (born Jonathan Casey, 1970). The Ultraviolence sound incorporates elements from various styles including hardcore techno/gabber, breakbeat hardcore, industrial techno, power noise, metal and rap, lyrics often telling a story in a concept album format. Johnny Violent has worked with several female artists on different releases, but as of 2005, singer, and angle grinding stage performer Mel Allezbleu has become a permanent member of the band.

Ultraviolence is a term from the novel A Clockwork Orange, referring to acts of extreme violence — random and unjustified (e.g. attacking a defenseless old man for sport).