Æthelmær the Stout or Æthelmær the Fat (died 1015) a leading thegn from the 980s, discðegn (dish-bearer or seneschal) to King Æthelred the Unready, and briefly ealdorman of the Western Provinces in 1013. He was the founder of Cerne Abbey and Eynsham Abbey, and a patron of the leading scholar, Ælfric of Eynsham. He was the son of Æthelweard the historian, and descended from King Æthelred I.