Deal Island is a census-designated place (CDP) in Somerset County, Maryland, United States.

25.8% of all households were made up of individuals, and 13.3% had someone living alone who was 65 years of age or older.

The island is famous for Joshua Thomas, who predicted the British defeat in the War of 1812.

The Deal Island Historic District, Sea Gull (skipjack), and St. John's Methodist Episcopal Church and Joshua Thomas Chapel are listed on the National Register of Historic Places.

[3] Since 1959, Deal Island has hosted an annual Labor Day weekend Skipjack Race.

Deal Island was once the home port for a large fleet of skipjacks and today has most of the few remaining skipjacks operating commercially for oystering on the Chesapeake Bay.

Also, during the Labor Day weekend, there is the annual Deal Island yard sale.

Deal Island's communities were once served by the Somerset Commuter (now Shore Transit), on Route 4, starting from Princess Anne's main transfer point.