| Peconic Bay | |
|---|---|
| Great Peconic Bay Little Peconic Bay | |
 | |
  Peconic Bay | |
| Location | Suffolk County, New York |
| Coordinates | 40°57′49″N 072°28′0″W / 40.96361°N 72.46667°W |
| Primary inflows | North Atlantic |
| Basin countries | United States |
| Max. depth | 80 ft (24 m) |
| Surface elevation | 10 ft (3.0 m) |
The Peconic Bay is the parent name for two bays (Great Peconic Bay and Little Peconic Bay) between the North Fork and South Fork of Long Island in Suffolk County, New York, United States. It is separated from Gardiners Bay by Shelter Island.