Page "Don (honorific)" Paragraph 13

Today, in Portugal and Brazil, Dom is ordinarily employed only for higher members of the clergy, and for superiors of religious orders, such as the Order of Saint Benedict, wherein it is also associated with the status of Dom Frater.

Dom is similarly used within the Benedictine Order throughout France and the English speaking world.

In France, it is also used within the male branch of the Carthusian Order.