Diocese of Oca may refer to the following ecclesiastical jurisdictions :
- the former Diocese of Oca (Asia Minor) in present Asian Turkey, now a Latin Catholic titular see
- the former Roman Catholic Diocese of Auca (Curiate name; Spanish Oca, modern Villafranca Montes de Oca), now also a Latin Catholic titular see
See also
- Oca (disambiguation) for secular namesakes
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