Orville Elias Babcock (December 25, 1835 – June 2, 1884) was an American Civil War General in the Union Army. He graduated third in his class as United States Military Academy in 1861. Babcock served in the Corps of Engineers throughout the Civil War. He was promoted to Brevet Brigadier General in 1865. Babcock served as aide-de-camp for Lieut. Gen. Ulysses S. Grant and participated in the Overland Campaign. After Grant became President in 1869, Babcock was appointed his Private Secretary—in modern terms, the chief of staff—and served until 1876. In 1869, Babcock was sent on a mission by President Grant to explore the possibility of annexing to the United States the mostly African island nation of Santo Domingo.