Bill Clements, American soldier, engineer, and politician, 15th United States Deputy Secretary of Defense (d. 2011)
William Perry Clements Jr. (April 13, 1917 – May 29, 2011) was an American businessman and Republican Party politician who served two non-consecutive terms as Governor of Texas between 1979 and 1991. His terms bookended the sole term served by Mark Wells White, a Democrat who defeated Clements in the 1982 election only to lose his campaign for re-election in 1986.

When Clements was first sworn in during 1979, he became the first Republican to have served as governor of Texas since Reconstruction. When Clements left office for good at the end of his second term in 1991, his eight years in office were the most served by any Texas governor until Rick Perry surpassed his total in 2009. Clements was the first governor to be elected to multiple terms since Texas changed its constitution in 1972 to extend their governor's term of office to four years; since then, Perry and his predecessor, George W. Bush and successor, Greg Abbott, also Republicans, have also won multiple terms.

Before he became Governor of Texas, Clements made his fortune in crude oil and served as United States Deputy Secretary of Defense for President Richard Nixon. After his first gubernatorial term ended, Clements joined the administrative staff at Southern Methodist University where he served as Chairman of the Board of Governors; while there, he presided over a massive pay-to-play system in the school's football program that resulted in catastrophic consequences for the team and the end of his political career.