Isis was an American avant-garde metal band founded in Boston, Massachusetts in 1997 but later based in Los Angeles. They borrowed from and helped to evolve the post-metal sound pioneered by bands such as Neurosis and Godflesh, characterized by lengthy songs focusing on repetition and evolution of structure.

in September 2006, a collaboration with Aereogramme entitled In the Fishtank 14 was released as part of a project of Dutch label Konkurrent in which two artists are given two days' studio time to write and record their work.