The Metropolitan Archdiocese of Baltimore is the archdiocese of the Latin Church of the Catholic Church in northern and western Maryland in the United States. It is the metropolitan see of the Ecclesiastical Province of Baltimore.

The Archdiocese of Baltimore is the oldest archdiocese in the United States. The Vatican granted the archbishop of Baltimore the right of precedence in the nation at liturgies, meetings, and Plenary Councils in 1859.  It is the premier episcopal see of the Catholic Church in the United States of America, as "prerogative of place".

As of 2020, the archdiocese had an estimated Catholic population of 525,000 with 198 diocesan priests, 193 religious priests and 169 permanent deacons in 139 parishes.

The Archdiocese of Baltimore has two major seminaries: St. Mary's Seminary and University in Baltimore and Mount St. Mary's Seminary in Emmitsburg.

It was revealed in late 2016 that the Archdiocese of Baltimore had paid off numerous settlements since 2011 for abuse victims.