William Neil Dennison | |
|---|---|
 | |
| Born | December 10, 1841 Cincinnati, Ohio, US |
| Died | December 31, 1904 (aged 63) Denver, Colorado, US |
| Buried | |
| Allegiance |  United States |
| Service | |
| Years of service | 1861–1870 |
| Rank |  Captain Brevet Lieutenant Colonel |
| Unit | 2nd U.S. Artillery |
| Commands | Battery G, 2nd U.S. Artillery Battery A, 2nd U.S. Artillery |
| Battles / wars | American Civil War |
William Neil Dennison (December 10, 1841 – December 31, 1904) was a United States Army artillery officer during the American Civil War and an attorney and business speculator during his postwar career.