Ex Deo is a Canadian death metal band formed in 2008 in Montreal, Quebec. The band is a side project of Kataklysm frontman Maurizio Iacono, based on the history of the Roman Empire.

On February 17, 2014, the band issued a statement declaring the band would be put on indefinite hold and a third album is unlikely. However, on September 9, 2015, Maurizio Iacono announced that the band has ended their hiatus and were working on a new album.