Adelphius

Adelphius or Adelfius may refer to:


 * Adelphius of Onuphis (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)