Charles Hamlin (September 13, 1837 – May 15, 1911), from Bangor, Maine, was an attorney and a Union Army officer during the American Civil War, attaining the rank of major. He was nominated for appointment to the grade of brevet brigadier general of volunteers by President Andrew Johnson on January 13, 1866, to rank from March 13, 1865, and the United States Senate confirmed the appointment on March 12, 1866. He was one of the sons of Vice President Hannibal Hamlin and a brother to Cyrus Hamlin, a Union Army brigadier general.