Johnston Blakeley
| Johnston Blakeley | |
|---|---|
| Blakeley in 1846 lithograph, entitled Naval Heroes of the United States | |
| Born | October 1781 Seaforde, County Down, Ireland | 
| Died | October 1814 (aged 32–33) Atlantic Ocean | 
| Place of burial | Lost at sea | 
| Allegiance | United States | 
| Branch | United States Navy | 
| Years of service | 1800–1814 | 
| Rank | Captain (posthumous) | 
| Commands | |
| Battles / wars | |
| Awards | |
| Relations | Charles Adams Blakely (great-grandnephew) | 
| Signature | |
Johnston Blakeley (October 1781 – October 1814) was a United States Navy officer who served during the Quasi-War and the War of 1812. He is considered to be one of the most successful American naval officers of the period.