| Fort Winthrop | |
|---|---|
| Governors Island, Boston Harbor, Massachusetts | |
 Late 19th-century engraving showing a view of the fort from Boston Harbor | |
  Fort Winthrop Location in Massachusetts | |
| Coordinates | 42°21′07″N 71°00′43″W / 42.35194°N 71.01194°W |
| Type | Coastal Defense |
| Site information | |
| Owner | Logan Airport |
| Condition | no remains |
| Site history | |
| Built | 1808-1812 |
| Built by | Lt. Colonel Sylvanus Thayer, US Army Corps of Engineers |
| In use | 1812-1905 |
| Demolished | 1905 |
| Battles/wars | War of 1812 American Civil War |
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Fort Winthrop, built in 1808 and named Fort Warren until 1834, was a defensive fortification in Boston Harbor named after John Winthrop, an early governor of the Massachusetts Bay Colony.