Ordo Ad Chao is the fourth full-length album by the Norwegian black metal band Mayhem. "Ordo ad chao" is incorrect Latin (correct: "Ōrdō ā chaos"). It is meant to be translated as "order to chaos" - a reversal of the Latin expression "ordo ab chao" ("order from chaos") often cited as the motto used in Freemasonry. The album received the Spellemann award for best metal album on 2 February 2008.