Mahaut of Châtillon
Born	1293
Died	(1358-10-03)3 October 1358
Noble family	Châtillon
Spouse(s)	Charles of Valois ​ ​ (m. 1308; died 1325)​
Issue	Marie, Duchess of Calabria Isabella, Duchess of Bourbon Blanche, Queen of Germany Louis, Count of Chartres
Father	Guy IV of Châtillon, Count of Saint-Pol
Mother	Marie of Brittany

Mahaut of Châtillon (1293– 3 October 1358) was the daughter of Guy IV of Châtillon, Count of Saint-Pol and Marie of Brittany, daughter of John II, Duke of Brittany.

In 1308 she married Charles, Count of Valois,^[1] the third son of King Philip III of France and Isabella of Aragon.^[2] He was also the younger brother of King Philip IV. Charles himself had married twice before; upon the death of his second wife Catherine of Courtenay in 1308, he married Mahaut. Mahaut and Charles had four children. One of their daughters would make them ancestors of French kings, and another daughter would become Queen of Germany.

Mahaut and Charles's children were:

• Marie (1309–1332). Married Charles, Duke of Calabria and had issue.
• Isabella (1313 – 26 August 1388). She married Peter I, Duke of Bourbon. Had issue
• Blanche (1317–1348). She married Charles IV, King of Germany and Bohemia (after her death, he became Holy Roman Emperor). Sometimes called "Marguerite". Had issue
• Louis, Count of Chartres (1318–1328). Died young, no issue

Her husband Charles died in 1325. Mahaut died 33 years later in 1358 at the age of 65, having outlived three of her four children; only her second daughter Isabella outlived her.

• Henneman, John Bell (1971). Royal Taxation in Fourteenth-Century France: The Development of War Financing, 1322–1359. Princeton University Press. ISBN 0-691-05188-7.
• Russell, Delbert W. (2013). "The Cultural Context of the French Prose "remaniement" of the Life of Edward the Confessor by a nun of Barking Abbey". In Wogan-Browne, Jocelyn (ed.). Language and Culture in Medieval Britain: The French of England, C.1100-c.1500. Boydell & Brewer.