John R. Massaro | |
|---|---|
 Sergeant Major John R. Massaro c. 1977 | |
| Born | May 22, 1930 Cleveland, Ohio, U.S. |
| Allegiance | United States |
| Service | United States Marine Corps |
| Years of service | 1948–1979 |
| Rank | Sergeant Major |
| Commands | Sergeant Major of the Marine Corps |
| Battles / wars | Korean War Vietnam War |
| Awards | Legion of Merit Navy and Marine Corps Commendation Medal (2) |
John R. Massaro (born May 22, 1930) is a retired United States Marine who served as the 8th Sergeant Major of the Marine Corps from 1977 to 1979.