Originally, the Duchy of Chartres (duché de Chartres) was the comté de Chartres, a County. 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.
- 882-886 Hastings, Norman Chief, beat Carloman II of France in 879, agreed to settle and received the County of Chartres. He sold it in 886 to finance an expedition during which he disappeared.
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.
- Married to Luitgarde of Vermandois
Theobold I was also known as Theobald the Cheat, or Theobald the Old. He was given the nickname “the Cheat” fighting with his neighbours, among them the kings of France, the dukes of Normandy, and the church of Reims. 
- Married to Bertha of Burgundy
- Married first in 1003 to Mathilde de Normandie († 1006)
- Married second to Ermengearde of Auvergne
- Married first to Gersende of Maine
- Married second to Adele of Valois
- Married to Adela of Normandy
- Married in 1123 to Matilda of Carinthia († 1161)
- Married in 1184 to Catherine of Clermont
1205-1218 Theobald VI, Count of Blois († 1218), son of the previous
- Married first to Mahaut of Alençon
- Married second to Clemence des Roches
- Married first to Sulpice d'Amboise
- Married second to Jean de Montmirail, Count of Cambrai († 1244).
1248-1256 Matilda of Amboise († 1256), Countess of Chartres
- Married to Richard II, Count of Beaumont, then to Jean II de Nesle
House of Blois-Châtillon
- Theobald V, Count of Blois married his second wife in 1164 to Alix of France and father of:
1256-1280 John I, Count of Blois († 1280), son of the previous
- married 1254 to Alice of Brittany (1243-1288)
1280-1291 Joan, Countess of Blois († 1292), daughter of the previous
- Charles, Count of Valois, (1270 † 1325), Count of Valois, Alençon, Perche, Chartres, Anjou and Maine
- John of Valois (1302 † 1310), Count of Chartres, son of Charles of Valois and Catherine I
- Louis of Valois (1318 † 1328), Count of Chartres, son of Charles of Valois and Mahaut of Châtillon
- Charles II of Alençon (1297 † 1346), Count of Alençon, Chartres, son of Charles of Valois and Margaret of Anjou
- Renée of France (1510 † 1574), Duchess of Chartres, daughter of Louis XII of France and Anne of Brittany, married to Ercole II d'Este, Duke of Ferrara
Duke of Chartres
Branch of Capetian de Valois
Fils de France
Branch of Capetian d'Orleans
From 1674 until today, the title of Duke of Chartres is the eldest son of the Duke of Orleans
1674-1701:Philippe II, said "the Pious" (1674–1723) son of preceding;
1703-1723:Louis IV (1703–1752) son of the previous;
1725-1752:Louis Philippe I, Duke of Orléans, "the Fat" (1725–1785) son of preceding;
1752-1785:Louis Philippe II, Duke of Orléans (1747–1793) son of the previous waives his title in 1792 and takes the name of "Philippe Equality";
1785-1793:Louis Philippe III, Duke of Orléans (1773–1850) son of preceding. Access to power in 1830 under the name of Louis-Philippe Ier.
1810-1830:Ferdinand-Philippe (1810–1842) son of preceding
- Robert, a younger brother of the comte de Paris was titled duc de Chartres
The title is currently held, as a courtesy title, by
- Charles-Louis, duc de Chartres,
- son of Jacques, duc d'Orléans, the uncle of the Orléanist claimant to the throne of France.
- Michel Dillange. Les Comtes de Poitou - Dukes of Aquitaine (778-1204). La Crèche: Geste éditions, 1995. ISBN 2-910919-09-9