Isis (stylized ISIS) was an experimental sludge / progressive / post-metal band in the vein of Neurosis, Godspeed You Black Emperor!, and Godflesh. Originally founded in 1997 in Boston, Massachusetts, the band relocated to Los Angeles, California in 2003.

On May 18, 2010, Isis announced that they were disbanding; they played their last show as an active band on June 23, 2010. The band’s statement said that they had done everything we wanted to do, said everything we wanted to say, citing an agreement they made early on to end before pushing past the point of a dignified death. The final lineup reunited for an October 13, 2018 benefit concert (paying tribute to Caleb Scofield), performing under the name Celestial due to the association of their namesake since disbanding.

Final line-up:
Aaron Turner – guitar, vocals (1997–2010)
Jeff Caxide – bass (1997–2010)
Aaron Harris – drums (1997–2010)
Michael Gallagher – guitar (1999–2010)
Bryant Clifford Meyer – electronics, guitar, vocals (1999–2010)

Former members:
Chris Mereschuk – electronics, vocals (1997–1998)
Randy Larson – guitar, vocals (1998)
Jay Randall – electronics, vocals (1999)

Isis (6) is also credited as copyright holder.