The Montgomery family or de Montgomerie is a prominent family of Anglo-Norman origin, belonging to both French and British nobility. At the turn of the 12th century, the family was one of the leading families, with Robert de Bellême being the wealthiest and most powerful magnate in England and Normandy. The House was succeeded by the House of Belleme.

The House of Bellême also referred to as the Family of Bellême was an important seigneurial family during the 10th through the 12th centuries. Members of this family held the important castles of Bellême, Alençon, Domfront and Sées as well as extensive lands in France, Normandy and Maine.