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William Ludlow (1843 - 1901) was an officer in the Corps of Engineers and a major general in the United States Army who served in the Civil War, Plains Indian Wars, the Spanish-American War, and led a scientific expedition examining the natural wonders of Yellowstone National Park. After the Civil War, Ludlow served in Charleston, South Carolina under Major Q.A. Gilmore until November 14, 1872, when he was reassigned to serve as Chief Engineer of Dakota Territory, where he oversaw mapping and data collection of the 7th Cavalry's 1874 expedition into the Black Hills of what is now South Dakota