Beaumanoir was a seigniory in what is now the department of Côtes-d'Armor, France, which gave its name to an illustrious family.
- Philippe de Rémi (died 1265), French poet and bailiff
- Philippe de Rémi (died 1296), French jurist and royal official
- Jean de Beaumanoir (14th century), marshal of Brittany
- Jean de Beaumanoir (marquis) (1551–1614), seigneur and afterwards marquis de Lavardin