Sin Dios (Godless) was a hardcore/anarcho-punk band from Spain. It was formed in 1988 in Madrid. Their first gigs were held in squatted houses (in Spanish Casa Okupa). In 1990 they released their first demo "…Ni amo" which contained 13 tracks and went to their first tour across the Spain always playing within autonomous and libertarian surroundings.

In 1991 they recorded with another band a split L.P., "Ruido Anticapitalista" (Anticapitalist Noise), produced by the bands and Potencial Hardcore (alternative label). Since then, they have produced five albums and went to numerous concert tours across Europe and Latin America.

On the 30th July 2006 the band announced that it would "cease its musical activity". The announcement was followed among other things by "TO OUR ENEMIES: WE CONTINUE ON OTHER FRONTS" and by denunciations of Israeli aggression, american imperialism and the like.