Peter John Sullivan | |
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 | |
| Born | March 15, 1821 Cork, Ireland |
| Died | March 2, 1883 (aged 61) Cincinnati, Ohio |
| Place of burial | Spring Grove Cemetery, Cincinnati, Ohio |
| Allegiance | United States of America Union |
| Service | United States Army Union Army |
| Years of service | 1861 - 1863 |
| Rank |  Colonel Brevet Brigadier General |
| Commands | 48th Ohio Infantry |
| Battles / wars | American Civil War |
Peter John Sullivan (March 15, 1821 – March 2, 1883) was an Irish-American soldier and lawyer, who became United States Ambassador to Colombia.