Æthelfrith (disambiguation)
Æthelfrith (died {{circa}} 616) was King of Bernicia and Deira in northern England.
Æthelfrith or Aethelfrith may also refer to:
- Æthelfrith of Elmham (died {{circa}} 745), Bishop of Elmham
- Æthelfrith of Mercia (fl. 883–915), Ealdorman in Mercia
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