Camp Dennison was a military recruiting, training, and medical post for the United States Army during the American Civil War. It was located near Cincinnati, Ohio, not far from the Ohio River. The camp was named for Cincinnati native William Dennison, Ohio's governor at the start of the war. The end of the Civil War in 1865 eliminated the need for Camp Dennison, which was deactivated in September. A small community, Camp Dennison, sprang up around the camp and hospital. Many of the later barns and homes used lumber and materials from the abandoned army camp.