In the Apg3 classification Acorales is in the Monocots, the first diverging clade. It consists of one family, Acoraceae. The name Acoridae is not used in the Apg3 classification.
In the Plant theory Acorales is placed in Acoridae, the first Subclass of the Class Lilianae, the Monocots. Acoridae has one Order, Acorales and one Family, Acoraceae.