Arnulf (or Arnoul, or Arnold) of Valenciennes (d. 22 October 1011), was a 10th and 11th century count and perhaps sometimes a margrave, who was lord of the fort of Valenciennes, which was at that time on the frontier with France (West Francia), on the river Scheldt. It was part of the pagus of Hainaut, in Lower Lotharingia, within the Holy Roman Empire.
In the 10th century he is often mentioned together with the margrave of the next imperial fort to the north, at Ename, who was also count of Mons, Count Godefrey "the captive".[1]
He was possibly the same person as his contemporary Arnulf the count of Cambrai.