William Frederick Mills (March 15, 1935 – September 7, 2009) was a Canadian trumpeter and educator best known for his work with the Canadian Brass quintet from 1972 to 1996. He also served as a professor for the University of Georgia from 1996 until 2009. 　　He also played solo, first-chair trumpet with the American Symphony Orchestra and the Houston Symphony Orchestra under Leopold Stokowski, the New York City Opera Orchestra, the New York City Ballet, American Ballet Theater, the National Arts Center Orchestra of Canada, the Casals Festival Orchestra in Puerto Rico and others, according to a biography from the University of Georgia.