Estopa is a rock duo founded in 1999 by brothers José and David Muñoz of Cornellà de Llobregat (Baix Llobregat), Catalonia. Their first album, Estopa, has sold well over 1,000,000 copies to date (the equivalent of an American platinum album) and their latest, Voces de Ultrarumba, sold more than 200,000 copies on its first day of release. Their playful, Rumba-tinged compositions have made them one of the most successful rock groups in Spanish history, in terms of both album sales and critical acclaim.

In 2005, Estopa signed a global music publishing deal with BMG Music Publishing.

The name of the group, "Estopa" (tow, in english) refers to when both brothers worked together at a SEAT automobile factory and, in their own words, a boss keeped on screaming at them, "¡Dale estopa!" which means something like "Work hard!".