John Franklin Farnsworth (March 27, 1820 – July 14, 1897) was a seven-term U.S.
Representative from Illinois (1857-1861, 1863-1873) and a colonel in the Union Army during the American Civil War.
He commanded brigades in the Cavalry Corps from September 1862 to February 1863.
He was nominated by President Abraham Lincoln for appointment to the grade of brigadier general on November 29, 1862 but was not confirmed by the United States Senate.
His nomination was ordered returned to President Lincoln on February 12, 1863.
He resigned his commission in the Union Army on March 4, 1863, the day he started his third term in Congress.