William Kevin Donley (born July 4, 1951) is an American former college football coach. He served as the head football coach at Anderson University in Anderson, Indiana from 1978 to 1981, Georgetown College in Georgetown, Kentucky from 1982 to 1992, California University of Pennsylvania from 1993 to 1996, and the University of Saint Francis in Fort Wayne, Indiana from the program's inception in 1997 through the 2024 season.

Donley holds the record for most wins by a National Association of Intercollegiate Athletics (NAIA) football coach. His 2016 and 2017 Saint Francis Cougars football teams won back-to-back NAIA championships, and his 1991 Georgetown Tigers team won the NAIA Division II Football National Championship. In addition to the 2016 and 2017 championships, Donley led Saint Francis to three consecutive NAIA title game appearances from 2004 to 2006. Donley has been named ACFA National Coach of the Year four times, after each of his three national championship seasons, and once more after the 2004 season. when his team also appeared in the championship game. For his coaching achievements, Donley has been inducted into several local, state and national halls of fame.

Donley is a native of Springfield, Ohio where he graduated from Shawnee High School in 1969. His playing career continued in college as a linebacker and fullback at Anderson College.

Donley served three seasons as the head football coach for Washington High School and amassed an overall record of 25–5.

After graduating from Anderson University in 1973 with a bachelor's degree in physical education, Donley returned to his alma mater in 1976 to serve as the linebackers coach and defensive line coach. After one season he was promoted to defensive coordinator. In 1978, at the age of 26, Donley was named the youngest head football coach in the country. Over the next four years, Donley's teams compiled an overall record of 28–9 (.757), winning the conference title in 1980 and 1981. Through the 2017 season, which marked 71 years of Anderson Ravens football, Donley's winning percentage stands as the best among all head coaches in program history. In 1980, Donley earned a master's degree in education from Ball State University.

Donley joined the Georgetown College staff as head coach in 1982. The high point of his tenure there came in 1991 when the Tigers went 13–1 and won the NAIA Division II Football National Championship. In the 14 games that season, the Tigers scored 744 points, among the most of all college football teams at all levels of play. For his team's achievements, Donley earned his first NAIA National Coach of the Year award.

Donley served as the head coach at California University of Pennsylvania from 1993 to 1996. In four seasons, Donley's teams compiled an uncharacteristic record of 11–33.

In 1997, Donley became the first head football coach at the University of Saint Francis. After a year of preparation, the Cougars began play in the 1998 season. In his first campaign, Donley led Saint Francis to a record of 2–8, their only losing season to date. Since 1999, his teams have lost more than three games only one time, in the 2014 season. Seven of Donley's squads have completed undefeated regular seasons (2002–2006, 2008, 2015), and three consecutive teams finished as national runners-up (2004–2006).