Reginar IV de Hainault Comte 335
- Født: Omkr 950
- Ægteskab (1): Hedwige|Heluis|Hadevich de France omkring 998
- Død: 1013 i en alder af ca. 63 år
 Notater:
His father was Count of Hainaut until 958, but fell in disgrace with Otto I, Holy Roman Emperor and lost his County to Godfrey I, Duke of Lower Lorraine.
He received the County of Mons in 973 but was replaced with Godfrey I, Count of Verdun in 974. He replaced Godfrey as Count of Mons in 998.
Reginar blev gift med Hedwige|Heluis|Hadevich de France, datter af Hugues Capet King of France og Adelaide d'Aquitaine, omkring 998. (Hedwige|Heluis|Hadevich de France blev født omkring 969 og døde efter 1013.)
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