Irenaeus (disambiguation)
Saint Irenaeus of Lugdunum was a Catholic bishop, theologian and early church father.
Irenaeus or similar may also refer to:
- Irenaeus (Bekish), primate of the Orthodox Church in America
- Irenaeus (grammarian), a first-century Greek grammarian from Alexandria
- Irenaeus (Susemihl), metropolitan bishop of Vienna and Austria of the Russian Orthodox Church and Soviet spy
- Irenaeus of Sirmium, bishop and martyr
- Irenäus Eibl-Eibesfeldt, Austrian ethnologist
- Patriarch Irenaios, patriarch of the Eastern Orthodox Patriarchate of Jerusalem