Diocese of Turku may refer to the three phases of the ecclesiastical jurisdiction with episcopal see in Turku (Åbo), in Finland:

• the former Roman Catholic Diocese of Turku (Åbo), later becoming the:
• Bishopric of Turku, originally Roman Catholic, later Lutheran, later becoming:
• the present Lutheran Archdiocese of Turku.

This disambiguation page lists articles associated with the title Diocese of Turku.
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