Gary B. Williams (born March 4, 1945) is an American university administrator and former college basketball coach. He served as the head coach at the University of Maryland, Ohio State University, Boston College, and American University. In 2002, he led Maryland to the NCAA Tournament Championship. Williams retired after the 2010–11 season, and remains at his alma mater, Maryland, as the special assistant to the athletic director.
A native of Collingswood, New Jersey, Williams played for Maryland as the starting point guard under coach Bud Millikan. He was a member of the 1966 Charlotte Invitational Tournament championship team and the 1965 Sugar Bowl Tournament championship team. He set a Maryland record for field goal percentage, going 8-for-8 from the field in an ACC game against South Carolina in 1966 (35 years later a Williams pupil, Lonny Baxter, would break that record, hitting all ten of his field goal attempts.) Williams was the Maryland team captain in 1967. He graduated in 1968 with a B.S. in Marketing. While at the University of Maryland, Williams was a member of Phi Delta Theta Fraternity.
Prior to entering the college ranks, Williams was a successful high school basketball coach at Woodrow Wilson High School in Camden, New Jersey. He won a NJSIAA State championship as head varsity coach at Wilson High. With his chance to learn under Dr. Tom Davis, Williams left to become an assistant basketball coach at Lafayette College in 1972 and continued at Boston College in 1977 until he became a head coach. He was also the head soccer coach at Lafayette College during his assistant coaching job.