Seigneur (French: "lord") may refer to:
- The possessor of a seigneurie (fiefdom) in medieval feudal or manorial systems.
- The Seigneurial system of New France
- The hereditary feudal ruler of the island of Sark, see also List of Seigneurs of Sark
- The word shares the same provenance as the Italian 'Signore', Portuguese 'Senhor' and Spanish 'Señor', which in addition to meaning 'Mr' is used to signify a feudal lord.