The following is a list of rulers of the County of Armagnac:

• William Count of Fézensac and Armagnac ?–960
• Bernard the Suspicious, first count privative of Armagnac 960–?
• Gerald I Trancaléon ?–1020
• Bernard II Tumapaler 1020–1061
• Gerald II 1061–1095
• Arnauld-Bernard II (associated 1072 for about ten years)
• Bernard III 1095–1110
• Gerald III 1110–1160
• Bernard IV 1160–1188
• Gerald IV Trancaléon 1188–1215
• Gerald V 1215–1219
  • Bernart Arnaut d'Armagnac 1217–1226, in opposition
• Pierre-Gerald 1219–1241
• Bernard V 1241–1245
• Mascarose I (countess) 1245
• Arnauld II, Count of Lectoure and Lomagne 1245–1249
• Mascarose II 1249–1256
• Eskivat de Chabanais, Lord of Chabannais 1249–1256
• Gerald VI 1256–1285
• Bernard VI 1285–1319
• Jean I 1319–1373
• Jean II the Hunchbacked 1373–1384
• Jean III 1384–1391
• Bernard VII 1391–1418
• Jean IV 1418–1450
• Jean V 1450–1473
• Charles I 1473–1497

• Charles II 1509–1525^[1]

• Henri I 1527–1555^[2]
• Jeanne of Albret 1555–1572^[3]
• Henry II (king of France as Henry IV 1572–1589)

• Henry de Lorraine, the Young 1607–1666
• Louis de Lorraine 1666–1718, son of the above;
• Charles de Lorraine 1718–1751, son of the above.