William Mayer Flett (July 21, 1943 – July 12, 1999) was a Canadian professional ice hockey player who played in the National Hockey League for the Los Angeles Kings, Philadelphia Flyers, Toronto Maple Leafs and Atlanta Flames. Flett then moved to the World Hockey Association, playing with the Edmonton Oilers, returning to the NHL with the Oilers in the 1979–80 NHL season.