John Robert Monaghan | |
|---|---|
 | |
| Born | 26 March 1873 Chewelah, Washington |
| Died | 1 April 1899 (aged 26) Vailele, Samoa |
| Allegiance | United States of America |
| Service | United States Navy |
| Years of service | 1895–1899 |
| Rank | Ensign |
| Battles / wars | Spanish–American War |
Ensign John R. Monaghan (26 March 1873 – 1 April 1899) was an officer in the United States Navy.