War Is a Racket is a speech and a 1935 short book by Smedley D. Butler, a retired United States Marine Corps Major General and two-time Medal of Honor recipient. Based on his career military experience, Butler discusses how business interests commercially benefit from warfare. He had been appointed commanding officer of the Gendarmerie during the 1915–1934 United States occupation of Haiti.

Major General Smedley Darlington Butler, nicknamed the Maverick Marine, was a senior United States Marine Corps officer. During his 34-year career, he fought in the Philippine–American War, the Boxer Rebellion, the Mexican Revolution, World War I, and the Banana Wars. At the time of his death, Butler was the most decorated Marine in U.S. history. By the end of his career, Butler had received sixteen medals, including five for heroism; he is the only Marine to be awarded the Brevet Medal as well as two Medals of Honor, all for separate actions.