Guy III of Châtillon, Count of Saint Pol (about 1254 – April 6, 1317), French nobleman, was the son of Guy II of Châtillon and Matilda of Brabant.
In 1292, he married Marie of Brittany, daughter of John II, Duke of Brittany and Beatrice of England. They had eight children:
He held the office of Grand Bouteiller of France.
He was placed in joint command (with Robert VI of Auvergne) of one of the two reserve "battles" of the French troops at the Battle of the Golden Spurs. He was able to escape when the French were routed by the Flemings, but his brother Jacques and many of his relatives were killed.
| Preceded by Hugh VI |
Count of Saint Pol 1292–1317 |
Succeeded by John II |