Régnier or Regnier is a French given name, personal name and surname, and may refer to:
Surname Regnier (surname) Régnier
Personal name Regnier I, Count of Hainaut (850–915), son of Gislebert, Count of Darnau and Ermengarde of Lorraine Regnier II, Count of Hainault (born 890), son of Regnier I, Count of Hainaut and Hersent of France Regnier III, Count of Hainaut (circa 920–973), son of Regnier II, Count of Hainaut Regnier de Graaf (1641–1673), Dutch physician and anatomist Rainerius, patron saint of Pisa
Other Régnier Motor Company, an aircraft engine manufacturer founded by Émile Régnier
See also Rainer (disambiguation) Reginar Reinier Reynier (disambiguation)