Franklin "Frank" Rockefeller (August 8, 1845 in Moravia, New York – April 15, 1917 in Cleveland, Ohio) was an American businessman and member of the prominent Rockefeller family.
He and his younger twin sister Frances, who died young, were born on August 8, 1845 in Moravia, New York. They were the youngest children of con artist William Avery "Bill" Rockefeller (1810–1906) and Eliza Davison (1813–1889). His two older brothers were Standard Oil co-founders John Davison Rockefeller (1839–1937) and William Avery Rockefeller Jr. (1841–1922).
Rockefeller's early years were spent in Richford, New York. With his father, he removed to Cleveland, Ohio, which would be the home base of his business endeavors.
In September 1861, while still underage, he joined the 7th Ohio Infantry and participated as an infantryman in the battles of Winchester, Port Republic, Cedar Mountain, Chancellorsville, Gettysburg, Lookout Mountain, and other battles including Sherman's march to Atlanta. He was wounded in the head by grape shot at Chancellorsville.
He held various jobs in Cleveland, eventually becoming involved in his brothers' Standard Oil Co. Frank became one of the principal promoters of the company, and later served as its Vice President. However Rockefeller fell out with his brothers, and left Standard Oil in 1898. The rift was caused by John D. not taking consideration of Frank's other interests in the Pioneer Oil Company, and quarrels with Frank's partner, James Corrigan, with whom he owned the Franklin Mine near Lake Superior. He moved with his family to a large ranch in Kansas, but he later returned to Ohio. The 8,000-acre ranch stood on a large tract of cheap land in Belvidere, Kansas, west of Wichita (originally spotted by his father on his travels). The property was remote from railroads, and his cattle could graze on vast, unfenced plains. Eventually the Atchison, Topeka and Santa Fe Railroad brought in fresh settlers shrinking the free range for cattlemen. This ruined the ranch for breeding beef, and Frank tried futilely to sell the depreciated property.