William Theodore Grier (born October 19, 1963) is an American college basketball coach.

[1] In his first season, Grier coached the Toreros to an upset of Gonzaga in the finals of the WCC tournament.

In April 2008, Grier explored the opening at Oregon State but decided to remain at San Diego.

[2] On March 16, 2015, the University of San Diego announced they parted ways with Grier.

[3] On August 24, 2015, Grier was announced as an assistant at Oklahoma State University, pending approved by the board of trustees.