The Great Seal of the State of Maryland is the official government emblem of the U.S. state of Maryland. Its official service is to authenticate acts by the General Assembly of Maryland, but it is also used for display purposes at most state buildings. Although the state seal has been changed in design several times throughout history, the current model represents the reverse side of the original seal.

Cecil Calvert, 2nd Baron Baltimore was an English politician, peer and lawyer who was the first proprietor of Maryland. Born in Kent in 1605, he inherited the proprietorship after the death of his father, George Calvert, 1st Baron Baltimore, for whom it had been intended. Calvert proceeded to establish and manage the Province of Maryland as a proprietary colony for English Catholics from his English country house of Kiplin Hall in North Yorkshire.