William Bly (15 May 1920 – 24 March 1982) was an English professional football goalkeeper who played in The Football League for Hull City. As of November 2016, he is fourth on Hull City's most league appearances list. Hull City and North Ferriby United contest the annual Billy Bly Memorial Trophy. He then joined Hull Brunswick, who played in Division Two of the Yorkshire League, where he remained until his retirement. He thereafter joined the coaching staff.