The Episcopal Diocese of Maryland forms part of Province 3 of the Episcopal Church in the United States of America. Having been divided twice, it no longer includes all of Maryland and now consists of the central, northern, and western Maryland counties of Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Frederick, Garrett, Harford, Howard, and Washington, as well as the independent city of Baltimore.

Thomas John Claggett was the first bishop of the newly formed American Episcopal Church to be consecrated on American soil and the first bishop of the recently established (1780) Diocese of Maryland.