"Uno, dos, ultraviolento" (in English: One, two, ultraviolent) is a song by Argentine punk rock band Los Violadores, featured as a single from their Y ahora que pasa, eh?
The song was Los Violadores breakthrough as one of the better known punk rock bands of Argentina.
The lyrics are inspired in the novel A Clockwork Orange.
It was also covered in the 1990s by former Chilean band Los Prisioneros member, Claudio Narea with great success in the country.
Die Toten Hosen have covered the single in their album La hermandad – en el principio fue el ruido.