Sui Generis is one of the most important rock bands in Argentinian history, enjoying enormous success and popularity during the first half of the 1970s and a following that lasts to the present throughout South America. Sui Generis disbanded on September 5, 1975 and, despite concerts that took place in 1980 and 2001, a permanent re-formation has been ruled out.

Sui generis (; ) is a Latin phrase, meaning "of its (his, her, or their) own kind; in a class by itself; unique".