Irenaeus (disambiguation)

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

Irenaeus or similar may also refer to:


 * Irenaeus (Bekish) (1892–1981), primate of the Orthodox Church in America
 * Irenaeus (grammarian), a first-century Greek grammarian from Alexandria
 * 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