William Whitcomb "Bill" Quillian (April 13, 1934 – July 12, 1973) was an American tennis player and coach. Quillian joined the University of Washington in Seattle as an undergrad in 1952. He played tennis throughout his time there, participating in the U.S. championships in 1952, 1953, 1954, 1955, 1956, 1957, and 1958. In 1958, he competed in Europe at the Wimbledon Championships and French Championships. Quillian played for the U.S. in the 1958 Davis Cup against Venezuela; at the quarterfinal of the Americas zone in Caracas in May, he won his doubles and singles match.