Alexander Caldwell McClurg (September 9, 1832 – April 15, 1901) was an American bookseller and military adviser from Pennsylvania. He was raised in Pittsburgh, Pennsylvania, where his father owned a prosperous foundry. Graduating from Miami University, McClurg briefly studied law before moving to Chicago, Illinois, to join a bookselling house. During the Civil War, McClurg served as a captain with the 88th Illinois Volunteer Infantry Regiment. After his advisory skills were noticed by General Alexander McDowell McCook, McClurg spent the rest of the war as an adviser to various generals. His most prominent position was as Chief of Staff and Adjunct General to Major General Jefferson C. Davis and the XIV Corps. After the war, McClurg returned to his bookselling house as a junior partner. McC