Diocese of Heraclea may refer to:
- Archdiocese of Heraclea in Europe , former Orthodox and titular Catholic metropolitan see at Marmara Ereğlisi in Turkey
- Diocese of Eraclea , former and now titular Catholic see at Eraclea in Italy
- Diocese of Heraclea at Latmus , former Orthodox and titular Catholic see at Heraclea at Latmus in Turkey
- Diocese of Heraclea Lyncestis , former Orthodox and titular Catholic see at Heraclea Lyncestis in North Macedonia
- Diocese of Heraclea Pontica , former Orthodox and titular Catholic see at Heraclea Pontica in Turkey
- Diocese of Heraclea Salbace , former Orthodox and titular Catholic see at Heraclea Salbace in Turkey