William Cyril Desmond Pacey, (May 1, 1917 – July 4, 1975), was a pioneer of Canadian literary criticism.
He was also a notable author of verse and short fiction and a long-time university administrator.
He was awarded the Lorne Pierce Medal by the Royal Society of Canada in 1972.As chair of the University of New Brunswick English Department in the 1940s, Pacey worked closely with Roy Daniels of the University of British Columbia to initiate English PhD programs at both universities, effectively breaking the academic stranglehold the University of Toronto held on higher education in Canadian universities.