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
 
See also
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