James Cameron (March 1, 1800 – July 21, 1861) was a Pennsylvanian who served as colonel of the 79th New York Volunteer Infantry Regiment of the Union Army during the early days of the American Civil War (Civil War). He was the brother of Simon Cameron, United States Senator and first United States Secretary of War in the cabinet of President Abraham Lincoln. At the age of 61, James Cameron was killed in action at the First Battle of Bull Run, the first large battle of the war, on July 21, 1861.