Roger I Armagnac (1190 – 22 March 1245) was Viscount of Fezensaguet.
He was the son of Bernard I, Viscount of Fezensaguet and Lomagne, and Geralda de Foix.
[1] Roger I of Fezensaguet married Pincelle, the Maid of Albret, daughter of Amanieu IV, Lord of Albret, and Asselide Tartas.
[2] Their children were: