Elon John Farnsworth | |
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| Born | July 30, 1837 Green Oak, Michigan, U.S. |
| Died | July 3, 1863 (aged 25) Gettysburg, Pennsylvania, U.S. |
| Place of burial | Rockton Cemetery, Rockton, Illinois |
| Allegiance | United States of America Union |
| Service/ | United States Army Union Army |
| Years of service | 1861–1863 |
| Rank |  Captain |
| Commands | 8th Illinois Cavalry Regiment 1st Brigade, 3rd Division, Cavalry Corps, Army of the Potomac |
| Battles/wars | |
| Alma mater | University of Michigan |
| Signature |  |
Elon John Farnsworth (July 30, 1837 – July 3, 1863) was a Union Army captain in the American Civil War. He commanded Brigade 1, Division 3 of the Cavalry Corps (Union Army) from June 28, 1863 to July 3, 1863, when he was mortally wounded and died at the Battle of Gettysburg. He was nominated by President Abraham Lincoln for appointment to the grade of brigadier general on June 29, 1863 but was not confirmed by the United States Senate before his death at Gettysburg.