Omar Alfredo Rodríguez-López is a Puerto Rican guitarist and songwriter. He has formed or played in several bands, including The Mars Volta, At the Drive-In, Antemasque, and Bosnian Rainbows. He was the bassist for the dub band De Facto. He has embarked on a solo career, both in studio and in concert, frequently described as experimental, avant-garde, or progressive. He has also collaborated with numerous artists, such as Damo Suzuki, John Frusciante, El-P, Mon Laferte and Calle 13.

The Mars Volta is an American progressive rock band from El Paso, formed in 2001. The band's only constant members are Omar Rodríguez-López and Cedric Bixler-Zavala, whose partnership forms the core of the band. The band's current line-up also includes founding member Eva Gardner (bass), Omar's brother Marcel Rodriguez-Lopez, Leo Genovese and Linda-Philomène Tsoungui (drums).