TheCounty of Mortain was a medieval county in theDuchy of Normandy in France centered on the town ofMortain, disputed betweenFrance andEngland during parts of theHundred Years' War. A choice landholding, usually either kept within the family of theduke of Normandy (or theking of France) or granted to a noble in return for service and favor. This was the main reason Mortain had so many counts and from different lineages, as shown below, during its long history.

• Mauger of Corbeil (988–1032)^{[citation needed]}
• William "Werlenc" [fr]^[1] (1032–1048)
• Robert, Count of Mortain (1049–1104)
• William, Count of Mortain (1104–1106)
• Robert II of Vitré (1106–1112)
• Stephen of England (1112–1135)
• Eustace IV of Boulogne (1135–1141)
• Geoffrey of Anjou (1141–1144)
• William of Blois (1154–1159)
• Vacant
• Marie of Boulogne andMatthew of Alsace (1167–1173)^{[citation needed]}
• Vacant
• John [later King of England] (1189–1199)
• Ida, Countess of Boulogne andRenaud de Dammartin (1204–1216)
• Matilda II of Boulogne (1216–1245) and...
  • Philip Hurepel (1216–1233)
  • Afonso III of Portugal (1238–1245)
• Jeanne de Dammartin (1245–1251) and ..
  • Walter of Châtillon (1245–1250)
• Vacant
• Joan II of Navarre (1328–1349)
• Vacant
• Peter d'Évreux (1401–1412)
• Catherine of Alençon (1412–1416) (his widow) and..
  • Louis, Duke of Guyenne (1412–1413)
  • Louis VII of Bavaria,Duke of Bavaria-Ingolstadt (1413–1416)
• Jean Dunois (1416–1417) and..
  • Charles of Le Maine (1416–1417)
  • Charles of Valois, Duke of Berry (1416–1417)

• Edward Holland (1418–1419)
• Thomas Langholme (1419–?)
• John of Lancaster, 1st Duke of Bedford (?–1435)
• Edmund Beaufort, 2nd Duke of Somerset (1435–1449)

• Charles of Le Maine (1449–1472)
• Charles IV, Duke of Anjou (1472–1481)
• Royal Domain
• Louis II, Duke of Montpensier (1529–1582)
• Francis, Duke of Montpensier (1582–1592)
• Henri de Bourbon, duc de Montpensier (1592–1608)
• Marie de Bourbon, duchesse de Montpensier (1608–1627) and..
  • Gaston de France, duc d'Orléans (1626–1660) (her widower)
• Anne Marie Louise d'Orléans, duchesse de Montpensier (1660–1693)
• Philippe de France, duc d'Orléans (1693–1701)
• Philippe II d'Orléans, duc d'Orléans (1701–1723)
• Louis d'Orléáns, duc d'Orléans (1723–1752)
• Louis Philippe I d'Orléans, duc d'Orléans (1752–1785)
• Louis Philippe II d'Orléans, duc d'Orléans (1785–1786)
• Royal Domain
• Henri d'Orléans, comte de Paris, duc de France (1984–2019) (never recognised it as his main title)

• Counts of Mortain
• Lists of French nobility
• Lists of counts of France
• Duchy of Normandy

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• Articles with unsourced statements from April 2009