Arnulf III, Count of Flanders
| Arnulf III | |
|---|---|
| Count of Flanders | |
| Reign | 1070-1071 |
| Predecessor | Baldwin VI |
| Successor | Robert I |
| Regent | Richilde, Countess of Hainaut |
| Born | c. 1055 |
| Died | 1071 Battle of Cassel |
| House | House of Flanders |
| Father | Baldwin VI, Count of Flanders |
| Mother | Richilde, Countess of Mons and Hainaut |
Arnulf III (died 22 February 1071) was Count of Flanders from 1070 until his death at the Battle of Cassel in 1071.