Alexander Caldwell McClurg (September 9, 1832 – April 15, 1901) was an American bookseller and military adviser from Pennsylvania.

Graduating from Miami University, McClurg briefly studied law before moving to Chicago, Illinois, to join a bookselling house.

[2] Upon the outbreak of the Civil War, McClurg enlisted as a private in Company D of the 16th Regiment Illinois State Militia.

[2] When the regiment arrived at Nashville, Tennessee, McClurg was named a judge advocate of a general court martial.

Following a command reorganization following the Battle of Chickamauga, McClurg was reassigned to the staffs of Philip Sheridan, George Henry Thomas, and Absalom Baird.

[2] Although General Davis petitioned McClurg to join the regular army, he instead returned to S. C. Griggs & Co. as a junior partner.

[2] The firm became known as Jansen, McClurg & Co. in 1872 after Griggs lost his assets in the Great Chicago Fire the year before.

McClurg co-founded the American Publishers Association and served as its first vice president shortly before his death.