Diocese of Buenos Aires

The term Diocese of Buenos Aires may refer to:


 * Roman Catholic Diocese of Buenos Aires, former name (diocese created in 1620, elevated to Archdiocese in 1866)
 * Greek Orthodox Archdiocese of Buenos Aires and South America, an archdiocese (metropolis) of the Ecumenical Patriarchate of Constantinople
 * Antiochian Orthodox Diocese of Buenos Aires and Argentina, a diocese (eparchy) of the Greek Orthodox Patriarchate of Antioch
 * Serbian Orthodox Diocese of Buenos Aires, an Eastern-Orthodox diocese of the Serbian Orthodox Church, created in 2011