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 Archdiocese of Buenos Aires and Argentina, an archdiocese 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
See also Buenos Aires Catholic Church in Argentina Serbian Orthodox Church in North and South America