William Slater Banowsky (March 4, 1936 – April 28, 2019) was an American academic administrator.
He served as president of Pepperdine University from 1971 to 1978, then as president of the University of Oklahoma from 1978 to 1982 when he resigned to become President of the Los Angeles Area Chamber of Commerce.
In 1983, Banowsky returned as OU president and served for two more years.
Banowsky was also Republican national committeeman for the state of California from 1973 to 1975.