William J. "Bill" McIlroy (4 July 1928 – 22 August 2013) was a British secularist and atheist activist, writer and editor. McIlroy was for many years editor of The Freethinker (three stints: 1970–71, 1975–December 1976, September 1981–December 1992) and general secretary of the National Secular Society (two stints: 1963–1970, 1972–1977). In 2005, he received a lifetime achievement award from the NSS for 50 years of service to the secularist movement.