Clinton Manges (August 22, 1923 – September 23, 2010) was a controversial oil tycoon in Texas in the 1970s and 1980s. Manges was born in Cement, Oklahoma. He began to amass his fortune in South Texas in the early 1970s, when he befriended Lloyd M. Bentsen, Sr., the father of U.S. Senator Lloyd Bentsen, and political boss George Parr, known as the "Duke of Duval." In 1971, Manges bought a 100,000-acre (400 km2) ranch in the county. He was a confidant and close friend of numerous officials, including the late Attorney General Jim Mattox, Garry Mauro and Lt. Gov. Bob Bullock.