Reginar may refer to:
- The House of Reginar
- Reginar, Duke of Lorraine (circa 850-915), head of the clan of Reginarids
- Reginar IV, Count of Mons (circa 950-1013), son of Reginar III, Count of Hainaut
- Reginar V, Count of Mons (circa 995-1039), eldest son of Reginar IV, Count of Mons and Hedwige of France
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