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is a unincorporated community in Allegany County, Maryland along the North Branch Potomac River. It was established in 1741 by Thomas Cresap, who built a trading post along an old Native American trail. The settlement was called "Shawanese Old Town" because it was the site of a Shawnee village abandoned about a decade earlier. In later years the explanatory prefix was dropped from the name and the place because known simply as "Oldtown." Cresap's son Michael Cresap was born at Oldtown. Dan Bower Lives in Oldtown.
A post office was established there on May 26, 1870. Oldtown is connected by a one-lane low water toll bridge to Green Spring in Hampshire County, West Virginia.