Saint Irenaeus of Lugdunum (Lyons) was a Catholic bishop, theologian and early church father.
Irenaeus or similar may also refer to:
Irenaeus (grammarian), first-century Greek grammarian from Alexandria Irenaeus (died 258), Christian martyr in ancient Rome Irenaeus of Sirmium (died 304), bishop and martyr Irenaeus Bekish (18921981), primate of the Orthodox Church in America Irenäus Eibl-Eibesfeldt (19282018), Austrian ethnologist Irenaios of Jerusalem (Irenaios Skopelitis) (19392023), patriarch of the Eastern Orthodox Patriarchate of Jerusalem Irenaeus Susemihl (19191999), metropolitan bishop of Vienna and Austria of the Russian Orthodox Church and Soviet spy
See also Irinej, the Slavic form of Irenaeus Irineu, the Portuguese form of Irenaeus Irénée, the French form of Irenaeus Irene (given name)