The 11th Regiment Massachusetts Volunteer Infantry was an infantry regiment in the Union army during the American Civil War. Organized in Boston in May 1861, the 11th Massachusetts was made up mostly of men from Boston, but also from Charlestown and Dorchester. The leading force behind the formation of the regiment was its first colonel, George Clark, Jr., who had been an officer in the Massachusetts state militia. The regiment was known as the "Boston Volunteers."