William Arthur Knibbs (born January 24, 1942 – September 16, 2006) was a Canadian professional ice hockey player who played 53 games in the National Hockey League with the Boston Bruins during the 1964–65 season. The rest of his career, which lasted from 1962 to 1975, was mainly spent in the American Hockey League. Knibbs scored seven goal for Boston in his lone NHL season. His first goal occurred on December 16, 1964 in the Bruins' 7-5 loss to the Chicago Blackhawks at Chicago Stadium.