Eadburh of Bicester was a 7th-century English nun and abbess whose precise historical identity is obscured by other Saxon saints sharing her name. She is believed to have been the daughter of either King Penda of Mercia or King Frithewald. Born in the village of Quarrendon, she lived in Buckinghamshire and reportedly co-founded an abbey near Aylesburg alongside her sister, Edith. She served as an abbess and provided religious training to her niece, Osgyth.