Originally, the Duchy of Chartres (duché de Chartres) was the comté de Chartres, an Earldom. The title of comte de Chartres thus became duc de Chartres. This duchy–peerage was given by Louis XIV of France to his nephew, Philippe II d'Orléans, at his birth in 1674. Philippe II was the younger son and heir of the king's brother, Philippe de France, Duke of Orléans.
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The northern portion of the County of Blois, bordering on Normandy, was sometimes alienated as the County of Chartres, but the Counts of Blois who possessed it did not use a separate title for it. In 1391, the death of the only son of Guy II, Count of Blois prompted him to sell the inheritance of the County of Blois to Louis of Valois, Duke of Orléans, merging the title into the royal dukedom.
After its revival and elevation, the title duc de Chartres was used by the House of Orléans, founded by Philippe de France, duc d'Orléans, and cadet branch of the House of Bourbon.
Holders of the title were:
The title is currently held, as a courtesy title, by