Rite: Roman (Latin)
Type: Titular Episcopal See
Name: Helenopolis in Bithynia (latine) / Elenopoli di Bitinia (Italiano) / Helenopolitan(us) in Bithynia (Latin)
Location: Hersek, pr. Bitinia I, m. Nicomedia, Turkiye
- Established as Titular Episcopal See of Helenopolis (latine) / Elenopoli (Italiano) / Drepanum (latine)
- 1925: Renamed as Titular Episcopal See of Helenopolis (latine) / Elenopoli (Italiano)
- 1926: Renamed as Titular Episcopal See of Helenopolis (latine) / Elenopoli di Bitinia (Italiano)
- 1933: Renamed as Titular Episcopal See of Helenopolis in Bithynia (latine) / Elenopoli di Bitinia (Italiano) / Helenopolitan(us) in Bithynia (Latin)