List of islands of Maryland
has 281 named islands within its many waters and waterways, including the Atlantic ocean; the Chesapeake bay and its many tributary tidal rivers, creeks and bays; as well as within larger whitewater rivers like the upper Potomac.
These Islands are relatively permanent, although some are disappearing on the scale of a few centuries, like Smith Island in the Chesapeake Bay.
There are also a number of unnamed islands in Maryland, many of which are very temporary in nature, lasting only a few years or decades, both in the tidal environment and also in Maryland's larger whitewater rivers. These come and go due to the effect of storms.
This is a list of named islands of Maryland.
| County | Island | River/Bay | Type |
| Anne Arundel County | Big Island | Rhode River | R |
| Anne Arundel County | Brewers Island | Marley Creek | R |
| Anne Arundel County | Dobbins Island | Sillery Bay | |
| Anne Arundel County | Flat Island | Sellman Creek | R |
| Anne Arundel County | Gibson Island | Chesapeake Bay | |
| Anne Arundel County | Goose Island | South River | R |
| Anne Arundel County | High Island | Rhode River | R |
| Anne Arundel County | Little Island | Sillery Bay | |
| Anne Arundel County | Snake Island | Patuxent River | R |
| Anne Arundel County | St. Helena Island | Little Round Bay | |
| Anne Arundel County | The Hammocks Island | Main Creek | R |
| Anne Arundel County | Three Sisters Islands | Chesapeake Bay | |
| Anne Arundel County | Turkey Point Island | South River | R |
| Anne Arundel County | White Rocks Islands | Patapsco River | R |
| Baltimore County | Carroll Island | Gunpowder River | R |
| Baltimore County | Hart Island | Chesapeake Bay | |
| Baltimore County | Hart Miller Island | Chesapeake Bay | |
| Baltimore County | Hathaway Island | Patapsco River | R |
| Baltimore County | Pleasure Island | Chesapeake Bay | |
| Baltimore County | Sue Island | Middle River | R |
| Calvert County | Solomons Island | Patuxent River | R |
| Calvert County | Broomes Island | Patuxent River | R |
| Calvert County | Buzzard Island | Patuxent River | R |
| Calvert County | Hog Island | Chesapeake Bay | |
| Calvert County | Ma Leg Island | Patuxent River | R |
| Cecil County | Garrett Island | Susquehanna River | R |
| Cecil County | Hen Island | Sassafras River | R |
| Cecil County | Herring Island | Elk River | R |
| Cecil County | Indian Rock Island | Susquehanna River | R |
| Cecil County | Knight Island | Sassafras River | R |
| Cecil County | Long Island | Susquehanna River | R |
| Cecil County | Mills Island | Susquehanna River | R |
| Cecil County | Rough Island | Susquehanna River | R |
| Cecil County | Rowland Island | Susquehanna River | R |
| Cecil County | Spencer Island | Susquehanna River | R |
| Cecil County | Steels Island | Susquehanna River | R |
| Cecil County | Sterrett Island | Susquehanna River | R |
| Charles County | Cooksey Island | Wicomico River | R |
| Charles County | Chopawamsic Island | Potomac River | R |
| Charles County | Cobb Island | Potomac River | R |
| Charles County | Craney Island | Potomac River | R |
| Charles County | Wills Island | Port Tobacco River | R |
| Dorchester County | Adam Island | Holland Straits | |
| Dorchester County | Asquith Island | Honga River | R |
| Dorchester County | Axies Island | Nanticoke River | R |
| Dorchester County | Barren Island | Chesapeake Bay | |
| Dorchester County | Bettys Island | Blackwater River | R |
| Dorchester County | Billys Island | Honga River | R |
| Dorchester County | Bloodsworth Island | Chesapeake Bay | |
| Dorchester County | Bull Point Island | Meekins Creek | R |
| Dorchester County | Cattail Island | Chesapeake Bay | |
| Dorchester County | Chance Island | Transquaking River | R |
| Dorchester County | Cherry Island | Little Choptank River | R |
| Dorchester County | Clay Island | Fishing Bay | |
| Dorchester County | Dunnock Island | Dunnock Slough | ? |
| Dorchester County | Elliott Island | Fishing Bay | |
| Dorchester County | Grays Island | Fishing Bay | |
| Dorchester County | Gunners Island | Chesapeake Bay | |
| Dorchester County | Hog Island | Hopper Straits | |
| Dorchester County | Holland Island | Chesapeake Bay | |
| Dorchester County | Hooper Island | Chesapeake Bay | |
| Dorchester County | James Island | Chesapeake Bay | |
| Dorchester County | Jenny Island | Chesapeake Bay | |
| Dorchester County | Langrells Island | Nanticoke River | R |
| Dorchester County | Long Island | Chesapeake Bay | |
| Dorchester County | Lower Hooper Island | Chesapeake Bay | |
| Dorchester County | Middle Hooper Island | Chesapeake Bay | |
| Dorchester County | Northeast Island | Chesapeake Bay | |
| Dorchester County | Opossum Island | Tar Bay | |
| Dorchester County | Pone Island | Chesapeake Bay | |
| Dorchester County | Poplar Island | Fishing Bay | |
| Dorchester County | Pot Island | Honga River | R |
| Dorchester County | Punch Island | Chesapeake Bay | |
| Dorchester County | Ragged Island | Little Choptank River | R |
| Dorchester County | Rowland Island | Blackwater River | R |
| Dorchester County | Sandy Island | Nanticoke River | R |
| Dorchester County | Sharpes Island | Chesapeake Bay | |
| Dorchester County | Snake Island | Fishing Bay | |
| Dorchester County | Spriggs Island | Blackwater River | R |
| Dorchester County | Spring Island | Holland Straits | |
| Dorchester County | Stingaree Island | Blackwater River | R |
| Dorchester County | Swan Island | Chesapeake Bay | |
| Dorchester County | Taylors Island | Chesapeake Bay | |
| Dorchester County | Upper Hooper Island | Chesapeake Bay | |
| Dorchester County | Woods Island | Blackwater River | R |
| Dorchester County | Woolford Island | Parsons Creek | R |
| Dorchester County | Wroten Island | Honga River | R |
| Frederick County | Cox Island | Potomac River | R |
| Frederick County | Heaters Island | Potomac River | R |
| Frederick County | Mason Island | Potomac River | R |
| Frederick County | Nolands Island | Potomac River | R |
| Frederick County | Paton Island | Potomac River | R |
| Frederick County | Reed Island | Potomac River | R |
| Garrett County | Hamilton Island | ? | |
| Harford County | Amos Island | Susquehanna River | R |
| Harford County | Dutch Island | Susquehanna River | R |
| Harford County | Hickorynut Island | Susquehanna River | R |
| Harford County | Meadow Island | Susquehanna River | R |
| Harford County | Monks Island | Chesapeake Bay | |
| Harford County | Monocacy Island | Chesapeake Bay | |
| Harford County | Mutton Islands | Susquehanna River | R |
| Harford County | Neds Island | Chesapeake Bay | |
| Harford County | Pooles Island | Chesapeake Bay | |
| Harford County | Robert Island | Susquehanna River | R |
| Harford County | Ross Island | Susquehanna River | R |
| Harford County | Rowland Island | Susquehanna River | R |
| Harford County | Snake Island | Susquehanna River | R |
| Harford County | Spencer Island | Susquehanna River | R |
| Harford County | Spesutie Island | Chesapeake Bay | |
| Harford County | Spry Island | Chesapeake Bay | |
| Harford County | St. Catherine Island | Susquehanna River | R |
| Harford County | Taylor Island | Chesapeake Bay | |
| Harford County | Tyding Island | Chesapeake Bay | |
| Harford County | Wood Island | Susquehanna River | R |
| Kent County | Cacaway Island | Langford Bay | |
| Kent County | Chase Island | Chester River | R |
| Kent County | Cockey Island | Chester River | R |
| Kent County | Eastern Neck Island | Chesapeake Bay | |
| Kent County | Little Neck Island | Chesapeake Bay | |
| Kent County | Millers Island | Chester River | R |
| Kent County | Pooles Island | Chesapeake Bay | |
| Kent County | Rush Island | Chesapeake Bay | |
| Montgomery County | Bealls Island | Potomac River | R |
| Montgomery County | Bear Island | Potomac River | R |
| Montgomery County | Cabin John Island | Potomac River | R |
| Montgomery County | Cedar Island | Potomac River | R |
| Montgomery County | Clagett Island | Potomac River | R |
| Montgomery County | Conn Island | Potomac River | R |
| Montgomery County | Elm Island | Potomac River | R |
| Montgomery County | Falls Island | Potomac River | R |
| Montgomery County | Gladys Island | Potomac River | R |
| Montgomery County | Grapevine Island | Potomac River | R |
| Montgomery County | Harrison Island | Potomac River | R |
| Montgomery County | Hermit Island | Potomac River | R |
| Montgomery County | Herzog Island | Potomac River | R |
| Montgomery County | High Island | Potomac River | R |
| Montgomery County | Katie Island | Potomac River | R |
| Montgomery County | Langly Island | Potomac River | R |
| Montgomery County | Mason Island | Potomac River | R |
| Montgomery County | Minnie Island | Potomac River | R |
| Montgomery County | Offutt Island | Potomac River | R |
| Montgomery County | Olmsted Island | Potomac River | R |
| Montgomery County | Perry Island | Potomac River | R |
| Montgomery County | Plummers Island | Potomac River | R |
| Montgomery County | Rocky Islands | Potomac River | R |
| Montgomery County | Rupert Island | Potomac River | R |
| Montgomery County | Scott Island | Potomac River | R |
| Montgomery County | Selden Island | Potomac River | R |
| Montgomery County | Sharpshin Island | Potomac River | R |
| Montgomery County | Sherwin Island | Potomac River | R |
| Montgomery County | Snake Island | Potomac River | R |
| Montgomery County | Swainson Island | Potomac River | R |
| Montgomery County | Sycamore Island | Potomac River | R |
| Montgomery County | Tenfoot Island | Potomac River | R |
| Montgomery County | Torpedo Island | Potomac River | R |
| Montgomery County | Trammel Island | Potomac River | R |
| Montgomery County | Turkey Island | Potomac River | R |
| Montgomery County | Van Deventers Island | Potomac River | R |
| Montgomery County | Vaso Island | Potomac River | R |
| Montgomery County | Wades Island | Potomac River | R |
| Montgomery County | Watkins Island | Potomac River | R |
| Queen Anne's County | Bodkin Island | Eastern Bay | |
| Queen Anne's County | Carpenter Island | Chester River | R |
| Queen Anne's County | DeCoursey Island | Wye River | R |
| Queen Anne's County | Herring Island | Eastern Bay | |
| Queen Anne's County | Hog Island | Prospect Bay | |
| Queen Anne's County | Johnson Island | Crab Alley Bay | |
| Queen Anne's County | Kent Island | Chesapeake Bay | |
| Queen Anne's County | Little Island | Crab Alley Bay | |
| Queen Anne's County | Long Marsh Island | Eastern Bay | |
| Queen Anne's County | Parson's Island | Eastern Bay | |
| Queen Anne's County | Philpots Island | Eastern Bay | |
| Queen Anne's County | Wye Island | Wye River | R |
| Somerset County | Big Island | Tangier Sound | |
| Somerset County | Boat Island | Chesapeake Bay | |
| Somerset County | Deal Island | Tangier Sound | |
| Somerset County | Deep Banks Island | Holland Straits | |
| Somerset County | Eastfield Island | Tangier Sound | |
| Somerset County | Fishing Island | Manokin River | R |
| Somerset County | Gab Island | Chesapeake Bay | |
| Somerset County | Hog Neck Island | Chesapeake Bay | |
| Somerset County | Holland Island | Chesapeake Bay | |
| Somerset County | Horse Hammock | Tangier Sound | |
| Somerset County | House Island | Tangier Sound | |
| Somerset County | Janes Island | Chesapeake Bay | |
| Somerset County | Jersey Island | Little Annemessex River | R |
| Somerset County | Little Deal Island | Tangier Sound | |
| Somerset County | Little Troy Island | Chesapeake Bay | |
| Somerset County | Maddox Island | Manokin River | R |
| Somerset County | Otter Island | Tangier Sound | |
| Somerset County | Piney Island | Manokin River | R |
| Somerset County | Pry Island | Holland Straits | |
| Somerset County | Smith Island | Chesapeake Bay | |
| Somerset County | Solomons Lump | Kedges Straits | |
| Somerset County | South Marsh Island | Chesapeake Bay | |
| Somerset County | St. Pierre Island | Manokin River | R |
| Somerset County | Swan Island | Chesapeake Bay | |
| Somerset County | Troy Island | Chesapeake Bay | |
| Somerset County | Turtle Egg Island | Holland Straits | |
| Somerset County | Western Islands | Kedges Straits | |
| St. Mary's County | Blakistone Island | Potomac River | R |
| St. Mary's County | Bullock Island | Wicomico River | R |
| St. Mary's County | Heron Island | Potomac River | R |
| St. Mary's County | Jimmy Island | St. Mary's River | R |
| St. Mary's County | St. Catherine Island | Potomac River | R |
| St. Mary's County | St. Clement's Island | Potomac River | R |
| St. Mary's County | Saint George Island | Potomac River | R |
| St. Mary's County | St. Margaret Island | Wicomico River | R |
| St. Mary's County | Tippity Wichity Island | St. Mary's River | R |
| St. Mary's County | White Point Island | Wicomico River | R |
| Talbot County | Avalon Island | Harris Creek | R |
| Talbot County | Bruffs Island | Wye River | R |
| Talbot County | Coaches Neck Island | Chesapeake Bay | |
| Talbot County | Goat Island | Chesapeake Bay | |
| Talbot County | Hambleton Island | Broad Creek | R |
| Talbot County | Herring Island | Miles River | R |
| Talbot County | Jefferson Island | Chesapeake Bay | |
| Talbot County | Nelson Island | Choptank River | R |
| Talbot County | Poplar Island | Chesapeake Bay | |
| Talbot County | Royston Island | Choptank River | R |
| Talbot County | Sharps Island | Chesapeake Bay | |
| Talbot County | Tilghman Island | Chesapeake Bay | |
| Washington County | Byrnes Island | Potomac River | R |
| Washington County | Duck Island | Potomac River | R |
| Washington County | Knott Island | Potomac River | R |
| Washington County | Shepherds Island | Potomac River | R |
| Wicomico County | Round Island | Nanticoke River | R |
| Worcester County | Assacorkin Island | Chincoteague Bay | |
| Worcester County | Assateague Island | Atlantic Ocean | |
| Worcester County | Ayers Island | Trappe Creek | R |
| Worcester County | Bay Island | Chincoteague Bay | |
| Worcester County | Beacon Clumps | Chincoteague Bay | |
| Worcester County | Big Island | Assawoman Bay | |
| Worcester County | Boar Island | Assawoman Bay | |
| Worcester County | Brady Island | Assawoman Bay | |
| Worcester County | Cedar Island | Chincoteague Bay | |
| Worcester County | Collier Island | Isle of Wight Bay | |
| Worcester County | Corn Hammock | Assawoman Bay | |
| Worcester County | Cropper Island | Newport Bay | |
| Worcester County | Devil Island | Assawoman Bay | |
| Worcester County | Dog and Bitch Island | Isle of Wight Bay | |
| Worcester County | Drum Island | Isle of Wight Bay | |
| Worcester County | Eagle Island | St. Martin River | R |
| Worcester County | Fenwick Island | Atlantic Ocean | |
| Worcester County | Gambage Island | Turville Creek | R |
| Worcester County | Grassy Island | Isle of Wight Bay | |
| Worcester County | Great Egging Island | Chincoteague Bay | |
| Worcester County | Hen and Chickens Island | St. Martin River | R |
| Worcester County | Hills Island | Assawoman Bay | |
| Worcester County | Hog Island | Johnson Bay | |
| Worcester County | Horn Island | Isle of Wight Bay | |
| Worcester County | Horse Island | Assawoman Bay | |
| Worcester County | Isle of Wight | Intracoastal Waterway | |
| Worcester County | Johns Hammock | Assawoman Bay | |
| Worcester County | Little Egging Island | Chincoteague Bay | |
| Worcester County | Lumber Island | Chincoteague Bay | |
| Worcester County | Mallard Island | Isle of Wight Bay | |
| Worcester County | Margots Island | St. Martin River | R |
| Worcester County | Mills Island | Chincoteague Bay | |
| Worcester County | Oak Island | Assawoman Bay | |
| Worcester County | Outward Trump | Chincoteague Bay | |
| Worcester County | Piney Island | Assawoman Bay | |
| Worcester County | Piney Island | Grey Creek | R |
| Worcester County | Piney Island | St. Martin River | R |
| Worcester County | Pope Island | Chincoteague Bay | |
| Worcester County | Rattlesnake Island | Martin Bay | |
| Worcester County | Reedy Island | Assawoman Bay | |
| Worcester County | Reedy Island | Isle of Wight Bay | |
| Worcester County | Rich Island | Assawoman Bay | |
| Worcester County | Robins Marsh | Chincoteague Bay | |
| Worcester County | Sandy Point Island | Sinepuxent Bay | |
| Worcester County | Shelldrake Island | Brockanorton Bay | |
| Worcester County | South Hammocks Island | Assawoman Bay | |
| Worcester County | St. George Island | ? | |
| Worcester County | Steves Island | Wicomico River | R |
| Worcester County | Tingles Island | Chincoteague Bay | |
| Worcester County | Tizzard Island | Johnson Bay | |
| Worcester County | Tulls Island | Assawoman Bay | |
| Worcester County | Twin Islands | Chincoteague Bay |