Adelphius or Adelfius may refer to:

• Adelphius of Onuphis [it] (4th century), Egyptian bishop
• Clodius Celsinus Adelphius (fl. 333–351), Roman politician
• Adelfius, a bishop from Britain noted as attending the 314 Council of Arles
• Adelfius I (bishop of Limoges) (b. c. 390), grandfather of St Ruricius
• Adelphius of Poitiers (fl. 533), bishop
• Adelfius II (bishop of Limoges) (fl. 4th century)
• Adelfius III (bishop of Limoges) (fl. late 7th century)

• Adelphus, bishop of Metz
• Adelfer
• Adelfia
• Adelfo
• Adelpha
• Adelphi (disambiguation)
• Adelphia (disambiguation)

This disambiguation page lists articles associated with the title Adelphius.
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