Eadburh of Bicester (also Eadburth, or Edburg, death c. 650) was an English nun, abbess, and saint from the 7th century. She has been called a "bit of a mystery"; or King Frithewald. Eadburgh was born in the now-deserted village of Quarrendon in Buckinghamshire. Her sister was Edith (or Eadith), with whom she co-founded an abbey near Aylesburg;
Eadburh probably became abbess at Aylesburg. She was also aunt of Osgyth, In 1182, her relics were moved to Bicester, when an Augustinian priory was founded by a group of Canons regular and dedicated to Saint Eadburgh and to the Virgin Mary.