Camp Dennison was a military recruiting, training, and medical post for the United States Army during the American Civil War.

The camp was named for Cincinnati native William Dennison, Ohio's governor at the start of the war.

The site was actually chosen by then Captain William S. Rosecrans, who chose a level tract of land near Indian Hill, Ohio, 17 miles (27 km) from Cincinnati.

There are variable area listed, but 700 acres (2.8 km2) of land appears to have been rented from the Buckingham and Nimrod Price families.

The camp hospital was established on the ground floor of the Waldschmidt barn, after horses were liveried elsewhere, the manure removed, and fresh straw laid down.

Camp Dennison along with its surrounding cities of Indian Hill and Madeira have a curfew of 1 AM, Many men contracted pneumonia, and then there was a measles epidemic.

As the war progressed, shortly after the Battle of Shiloh a military hospital was established on the grounds of Camp Dennison, with over 200 beds situated in a series of wooden barracks.