Katolička prigradska biskupija Ostia je crkveno područje koje se nalazi unutar metropolitanskog grada Rima u Italiji. Jedna je od sedam prigradskih biskupija.

Sadašnji biskup je kardinal Giovanni Battista Re. Od 1150. godine njezin je biskup - dekan kardinalskog zbora.The Cardinals of the Holy Roman Church – Guide to documents and events (76–2005) This statement of Miranda is unsourced. Moreover, Rudolf Hüls (pp.79–80) has demonstrated that the perpetual leadership of the Bishop of Ostia is not the case, but that the principle of seniority held true in Rome as it did elsewhere (cf. Hüls, pp. 77–78), before and after Pope Eugenius III. It was not until Pope Paul IV that the Deanship and the Bishopric of Ostia were tied together, in his Bull of 22 August 1555, Cum venerabiles. Biskupijska katedrala je Basilica di Sant'Aurea.

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Kategorija:Rim Kategorija:Rimokatolička Crkva u Italiji