Reginar IV, Count of Mons
| Reginar IV | |
|---|---|
| Count of Mons | |
| Born | 950 | 
| Died | 1013 (aged about 63) | 
| Noble family | Reginar | 
| Spouse(s) | Hedwig of France | 
| Issue | Reginar V, Count of Mons Lambert of Mons Beatrix | 
| Father | Reginar III, Count of Hainaut | 
| Mother | Adela | 
Reginar IV, Count of Mons, in Hainaut, (c. 950–1013) was the son of Reginar III and Adela. His father died in exile in Bohemia in 973.