Saint Irenaeus of Lugdunum (Lyons) was a Catholic bishop, theologian and early church father.

Look up Irenaeus or Irenæus in Wiktionary, the free dictionary.

Irenaeus or similar may also refer to:

• Irenaeus (Bekish) (1892–1981), primate of the Orthodox Church in America
• Irenaeus (Susemihl) (1919–1999), metropolitan bishop of Vienna and Austria of the Russian Orthodox Church and Soviet spy
• Irenaeus of Sirmium (died 304), bishop and martyr
• Irenäus Eibl-Eibesfeldt (1928–2018), Austrian ethnologist
• Patriarch Irenaios (Irenaios Skopelitis) (born 1939), patriarch of the Eastern Orthodox Patriarchate of Jerusalem

• Irinej, the Slavic form of Irenaeus
• Irineu, the Portuguese form of Irenaeus
• Irénée, the French form of Irenaeus
• Irene

This disambiguation page lists articles associated with the title Irenaeus.
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