Opera IX is an Italian symphonic black metal band, founded in the city of Biella by the guitarist Ossian in 1988.

There were many line-up changes, eventually settling with Cadaveria's vocals, Ossian at guitar, Vlad at bass and Flegias at drums.

After the CD was released, Opera IX replaced the keyboard player with a new member: Triskent.

In April 1998 the band's second full-length album Sacro Culto was released by the Belgian label Shiver Records.

In January of the following year they recorded their third album, The Black Opera - Simphoniae Misteriorum in Laude Tenebrarum, at the Underground studios in Sweden.

In September 2001 Avantgarde released a remastered The Call of the Wood with new cover artwork and two bonus tracks: "Rimes About Dying Stones" and "Born In The Grave".

As of December 2003, the current Opera IX line up features M The Bard on vocals and Dalamar on drums.