John O'Dea | |
|---|---|
 O'Dea in 1880 | |
| Born | c. 1839 Ireland |
| Died | 1905 (aged 65–66) Quincy, Illinois, United States |
| Place of burial | Sunset Cemetery, Quincy, Illinois |
| Allegiance | |
| Service/ | |
| Rank | Private |
| Unit |  Company D, 8th Missouri Volunteer Infantry |
| Battles/wars | |
| Awards | Medal of Honor |
John O'Dea (c. 1839 – 1905) was a Union Army soldier during the American Civil War. He received the Medal of Honor for gallantry during the Siege of Vicksburg on May 22, 1863.