Margaret of Valois (1295–1342) was a French noblewoman. She was a daughter of Charles, Count of Valois, and his first wife, Margaret, Countess of Anjou. She was also a sister of King Philip VI of France.
In 1310, she married Count Guy I of Blois. They had three children together:
Louis II (d. 1346), count of Blois and lord of Avesnes, married Joan of Beaumont.
Charles (d. 1364), married Joan of Penthièvre.
Marie, married:
in 1334 to Rudolph, Duke of Lorraine (d. 1346)
Frederick VII, Count of Leiningen-Dagsburg.