The Archdiocese of Miami is a Latin Church archdiocese of the Catholic Church in South Florida in the United States. It is the metropolitan see for the Ecclesiastical Province of Miami, which covers all of Florida.

Miami-Dade County is a county located in the southeastern part of the U.S. state of Florida. The county had a population of 2,701,767 as of the 2020 census, making it the most populous county in Florida and the seventh-most populous county in the United States. It is Florida's third largest county in terms of land area with 1,946 square miles (5,040 km2). The county seat is Miami, the core of the nation's ninth-largest and world's 65th-largest metropolitan area with a 2020 population of 6.138 million people, exceeding the population of 31 of the nation's 50 states as of 2022.