Arco Iris (Spanish, 'rainbow') were a rock group from the late 1960s until the late 1970s in Argentina, influential in Argentine rock history.

While tagged as an 'acoustic' Argentine rock band in the beginning, Arco Iris were pioneers (with Chilean band Los Jaivas), infusing rock with regional folk music, as well as one of the first bands that projected their beliefs through their music and lifestyle (in their case around the art of yoga). In the late 70s Arco Iris – minus Gustavo Santaolalla – moved to the United States to live in the mountains of California, where they have been involved in the jazz-rock and new-age music scene.

Arco Iris founding member and frontman Gustavo Santaolalla would emerge, in the 1980s, as one of the artists and producers that aided the rise of Rock en Español (with Miguel Mateos, Charly Garcia, etc.) by promoting rock acts all over Latin America.