Eadburh (Old English: Ēadburh), also spelled Eadburg, (fl. 787-802) was the daughter of King Offa of Mercia and Queen Cynethryth. She was the wife of King Beorhtric of Wessex, and according to Asser's Life of Alfred the Great she accidentally killed her husband by poison. She fled to Francia, where she is said to have been offered the chance of marrying Charlemagne, but ruined the opportunity. Instead she was appointed as the abbess of a convent.