John, Count of Saint-Pol

John of Châtillon, Count of Saint-Pol (died 1344), was the eldest son of Guy IV of Châtillon and Marie of Brittany, and held the county from 1317. He was a first cousin of Duke John III of Brittany and Queen Joan I of Navarre.

In 1329 he married Jeanne de Fiennes, whose brother Robert de Fiennes later became constable of France. He served Philip VI of Valois against Edward III of England at the outset of the Hundred Years' War.

When John died the county passed to his son Guy V; after Guy died without children it went through John's daughter Mathilde to the Luxembourg-Ligny family.