Æthelfrith (died c. 616) was King of Bernicia and Deira in northern England.
Æthelfrith or Aethelfrith may also refer to:
- Æthelfrith of Elmham (died c. 745), Bishop of Elmham
- Æthelfrith of Mercia (fl. 883–915), Ealdorman in Mercia
This page or section lists people that share the same given name.
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