| John O'Neal | |
| Birth Date: | c. 1841 |
| Birth Place: | Ireland |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States of America |
| Branch: | United States Navy |
| Rank: | Boatswain's Mate |
| Awards: | Medal of Honor |
John O'Neal (c. 1841—after 1872) was an Irish-born United States Navy sailor who received the Medal of Honor for heroism on April 12, 1872.
Serving on board the U.S.S. Kansas, O'Neal displayed great coolness and self-possession at the time Comdr. A. F. Crosman and others were drowned near Greytown, Nicaragua, 12 April 1872, and by personal exertion prevented greater loss of life.[1]