Ragenar (Latin Ragenarius, French Ragenaire or Réginaire) was the bishop of Amiens from 830 to 833 and again from 834 until his death in 849.
His predecessor, Jesse, was initially deposed by the Emperor Louis the Pious in 830 for conspiring with his rebellious son Lothair.
In 833 he was restored when Lothair forced his father to make public obeisance at an assembly in Soissons.
[3] He was present at the Synod of Thionville in 835, where Archbishop Ebbo of Reims, who with Lothair had restored Jesse to Amiens in 833, was deposed.
[3] Ragenar attended the regional synod in Quierzy-sur-Oise, held before Easter (14 April) 849, where the doctrine of Gottschalk of Orbais was condemned.