Oscar Hugh La Grange (April 3, 1837 – January 5, 1915) was a colonel in the Union Army during the American Civil War who was nominated and confirmed for appointment to the grade of brigadier general in 1866.
Oscar Hugh La Grange was born on April 3, 1837, in Fulton, Oswego County, New York. In 1845, he and his family moved to Ripon, Wisconsin. He attended Ripon College and the University of Wisconsin in Madison.
La Grange became an active abolitionist, participating in the Bleeding Kansas conflicts and helping to free Sherman Booth from jail. After his military career, he became superintendent of the San Francisco Mint.
Oscar La Grange died of pneumonia on January 5, 1915, in New York City.
After the outbreak of the American Civil War in 1861, La Grange joined the Army and was assigned to the 4th Wisconsin Volunteer Regiment. Later that year, he transferred to the 1st Wisconsin Volunteer Cavalry Regiment. In 1863, La Grange became a brigade commander in the Army of the Cumberland under the command of future U.S. Representative William Rosecrans. He later took part in the Battle of Chickamauga. In 1864, La Grange was serving in the Battle of Rocky Face Ridge when he was taken prisoner by Joseph Wheeler.