The Guns of August is a 1962 book centered on the first month of World War I written by Barbara W. Tuchman. After introductory chapters, Tuchman describes in great detail the opening events of the conflict. The book's focus then becomes a military history of the contestants, chiefly the great powers.

Barbara Wertheim Tuchman was an American historian, journalist and author. She won the Pulitzer Prize twice, for The Guns of August (1962), a best-selling history of the prelude to and the first month of World War I, and Stilwell and the American Experience in China (1971), a biography of General Joseph Stilwell.