List of islands of Connecticut
This is a list of islands of Connecticut. The list does not include named minor rock outcroppings, former islands that are now connected to the mainland by landfill, or false islands that are connected by thin slivers of land to the mainland. Unless otherwise indicated, listed islands are in Long Island Sound.
| Name | Town | Coordinates | Notes |
| Andrews Island | Branford | ||
| Andrews Island | Stonington | ||
| Ball Island | New Haven | Mill River | |
| Barn Island | Stonington | ||
| Barton Island | Griswold | Pachaug Pond | |
| Bear Island | Branford | Part of Thimble Islands | |
| Beers Island | Branford | Part of Thimble Islands | |
| Belden Island | Branford | ||
| Betts Island | Norwalk | Part of Norwalk Islands | |
| Bluff Island | Greenwich | ||
| Bowers Island | Greenwich | ||
| Brockway Island | Essex | Connecticut River | |
| Burr Island | Branford | ||
| Calf Islands | Greenwich | ||
| Calf Pasture Island | Norwalk | Part of Norwalk Islands | |
| Calves Island | Old Lyme | Connecticut River | |
| Candlewood Isle | New Fairfield | Candlewood Lake | |
| Canfield Island | Norwalk/Westport | ||
| Carting Island | Stratford | Housatonic River | |
| Cat Island | Branford | Part of Thimble Islands | |
| Cedar Hammock | Norwalk | ||
| Cedar Island | Branford | ||
| Cedar Island | Brookfield | New Milford Bay | |
| Cedar Island | Clinton | Connected to mainland by landfill | |
| Charles Island | Milford | Connected by sandbar to mainland during low tide. | |
| Chauncey Island | Ridgefield | Lake Naraneka | |
| Chimon Island | Norwalk | Part of Norwalk Islands | |
| Clam Island | Branford | ||
| Clown Island | Torrington | ||
| Cockenoe Island | Westport | Part of Norwalk Islands | |
| Copps Island | Norwalk | Part of Norwalk Islands Connected by sandbar to Crow Island | |
| Cove Island | Greenwich | ||
| Crab Island | Darien | ||
| Crow Island | Norwalk | Part of Norwalk Islands Connected by sandbar to Chimon Island and Copps Island | |
| Curatole Island | New Hartford | West Hill Pond | |
| Cut in Two Island | Branford | Part of Thimble Islands | |
| Cuties Island | Stamford | Also a ghost town. | |
| Davis Island | Branford | Part of Thimble Islands | |
| Deer Island | Sherman | Candlewood Lake | |
| Deer Island | Litchfield | Bantam Lake | |
| Diving Island | Greenwich | ||
| Dodges Island | Stonington | ||
| Dog Island | Norwalk | Part of Norwalk Islands | |
| Dogfish Island | Branford | Part of Thimble Islands | |
| Duck Island | Westbrook | ||
| Duck Island | Milford | Charles E. Wheeler Wildlife Management Area | |
| Dunks Island | Old Saybrook | Wetlands off Plum Back River | |
| East Crib | Branford | Part of Thimble Islands | |
| East Stooping Bush Island | Branford | Part of Thimble Islands | |
| Elihu Island | Stonington | ||
| Enders Island | Stonington | ||
| Eustasia Island | Lyme | Connecticut River | |
| Falkner Island | Guilford | ||
| Fayerweather Island | Bridgeport | Long Island Sound near Black Rock Harbor. | |
| Fish Islands | Darien | ||
| Foskett Island | Guilford | ||
| Fowler Island | Milford | Housatonic River | |
| Fox Island | Lebanon | Williams Pond | |
| Frisbie Island | Branford | ||
| Gates Island | Groton | ||
| Gildersleeve Island | Portland | Connecticut River | |
| Goat Island | Stonington | ||
| Goodyear Island | New Milford/Bridgewater | Lake Lillinonah | |
| Goose Island | Greenwich | ||
| Goose Island | Stratford | Housatonic River | |
| Goose Island | Old Lyme | Connecticut River | |
| Goose Island | Westport | Part of Norwalk Islands | |
| Gorham Island | Westport | Saugatuck River | |
| Governor Island | Branford | Part of Thimble Islands | |
| Governors Island | Hampton | Pine Acres Lake | |
| Grannis Island | New Haven | Quinnipiac River | |
| Grass Island | Stamford | ||
| Grassy Island | Norwalk/Westport | Part of Norwalk Islands | |
| Great Captain Island | Greenwich | ||
| Great Island | Old Lyme | ||
| Green Island | Branford | ||
| Green Island | Sherman | Candlewood Lake | |
| Greenaway Island | Stamford | ||
| Greenwich Island | Greenwich | ||
| Griswold Island | East Lyme | ||
| Haddam Island | Haddam | Connecticut River | |
| Hall Island | Stonington | Pawcatuck River | |
| Hen Island | Branford | Part of Thimble Islands | |
| High Island | Branford | Part of Thimble Islands | |
| Hobs Island | Groton | Thames River | |
| Holly Hock Island | Norwich | Yantic River | |
| Horse Island | Greenwich | ||
| Horse Island | Branford | Part of Thimble Islands | |
| Horse Island | Guilford | ||
| Hoyt Island | Norwalk | ||
| Huntley Island | East Lyme | ||
| Inner White Top | Guilford | ||
| Jack Island | Stamford | ||
| Johnson Island | Branford | Part of Thimble Islands | |
| Kelsey Island | Branford |