Ordo Ad Chao is the fourth full-length album by the Norwegian black metal band Mayhem.

[7] Ordo Ad Chao is the first album to feature vocalist Attila Csihar since the 1994 debut De Mysteriis Dom Sathanas and the last with Blasphemer before he announced his departure from the band in 2008.

[8] He concluded "the production sounds necro as fuck, but that's the way we wanted it – this time.

There is a version of the album supplied in a metal case that is limited to a production of 3,000.

[9] All lyrics are written by Attila except "Anti", which is by both Atilla and Blasphemer; all music is composed by BlasphemerMayhem Additional personnel