Diocese of Beirut or Eparchy of Beirut may refer to:
- Syriac Catholic Diocese of Beirut, patriarchal diocese of the Syriac Catholic Church, centered in Beirut
- Chaldean Catholic Diocese of Beirut, a Chaldean Catholic diocese, centered in Beirut
- Roman Catholic Diocese of Beirut, former (medieval) Roman Catholic diocese, centered in Beirut
It may also refer to:
- Armenian Apostolic Diocese of Lebanon, an Armenian Oriental-Orthodox diocese, centered in Beirut