James Martinus Schoonmaker Sr. | |
|---|---|
 James Martinus Schoonmaker circa 1913 | |
| Born | June 30, 1842 Pittsburgh, Pennsylvania, US |
| Died | October 11, 1927 (aged 85) Pittsburgh, Pennsylvania, US |
| Place of burial | Homewood Cemetery, Pittsburgh, Pennsylvania |
| Allegiance | United States of America Union |
| Service/ | Union Army |
| Years of service | 1861 - 1865 |
| Rank | Colonel |
| Commands | 14th Pennsylvania Cavalry |
| Battles/wars | American Civil War • Third Battle of Winchester |
| Awards | Medal of Honor |
| Other work | Railroad executive |
James Martinus Schoonmaker Sr. (June 30, 1842 – October 11, 1927) was a German American colonel in the Union Army in the American Civil War and a vice-president of the Pittsburgh and Lake Erie Railroad. He received the Medal of Honor for gallantry at the Third Battle of Winchester on September 19, 1864.