Charles III of Valois (March 12, 1270 – December 16, 1325) was the third son of Philip III of France and Isabella of Aragon. His mother was a daughter of James I of Aragon and Yolande of Hungary. Yolande was the only daughter of Andrew II of Hungary by his second wife Yolande de Courtney.

Charles was the father of Phillip VI, and paternal uncle to three kings ( Louis X, Phillip V, and Charles IV). In 1285 he gained the title of Count of Valois, and Count of Anjou and Maine in 1290. During his life, he unsuccessfully sought the rule of four other kingdoms: Aragon, Sicily, Constantinople and the Holy Roman Empire.

Marriage and Children
His first marriage, in 1290, was to Marguerite of Anjou and Maine (1274–1299), daughter of King Charles II of Naples. They had the following children:
• Isabelle (1292–1309). Married Jean III, Duke of Brittany.
• Philip VI, first King of the Valois Dynasty.
• Jeanne of Valois (1294–1342). Married William III, Count of Hainaut and had issue.
• Marguerite of Valois (1295–1342). Married Guy I of Blois-Châtillon, Count of Blois, and had issue.
• Charles II, Count of Alençon (1297 – August 26, 1346 at the Battle of Crécy). Married first Jeanne de Joigny and second Marie de la Cerda and had issue from the second marriage.
• Catherine of Valois (b. 1299, died young).
In 1302 he remarried to Catherine I of Courtenay (1274–1308), titular Empress of Constantinople. They had four children:
• John, Count of Chartres (1302–1308).
• Catherine de Valois-Courtenay, titular Empress of Constantinople (1303–1346). She married Philip I d'Anjou, Prince of Taranto and had issue.
• Jeanne de Valois (1304–1363). Married Count Robert III of Artois and had issue.
• Isabel of Valois (1305–1349), Abbess of Fontevrault.
Finally, in 1308, he married Mahaut of Chatillon (1293–1358), daughter of Guy III of Châtillon, Count of Saint Pol. They had also four children:
• Marie of Valois (1309–1332). Married Charles d'Anjou, Duke of Calabria and had issue.
• Isabella de Valois (1313 – August 26, 1388). She married Peter I, Duke of Bourbon.
• Blanche of Valois (1317–1348). She married Charles IV, Holy Roman Emperor. Sometimes called "Marguerite".
• Louis, Count of Chartres (1318–1328)