Guy I of Clermont (1286 – Kortrijk, July 11, 1302) was Lord of Breteuil and Offemont and a Marshal of France.
He was the youngest son of Simon II of Clermont and Adele of Montfort.
In 1296 he became Marshal of France, when his elder brother Raoul of Clermont was already Constable of France. Together with his brother, he fought in 1302 against the Flemish in the Battle of the Golden Spurs, and both were killed.