Bill Masterton, Canadian-American ice hockey player (b. 1938)
William Masterton (August 13, 1938 – January 15, 1968) was a Canadian American professional ice hockey centre who played in the National Hockey League (NHL) for the Minnesota North Stars in 1967–68. He is the only player in NHL history to die as a direct result of injuries suffered during a game, the result of massive head injuries suffered following a hit during a January 13, 1968 contest against the Oakland Seals.

A college standout with the Denver Pioneers, Masterton was a member of National Collegiate Athletic Association (NCAA) championship teams in 1960 and 1961, was twice an NCAA All-Star and was the most valuable player of the 1961 NCAA Division I Men's Ice Hockey Tournament. He briefly played in the Montreal Canadiens organization before settling in Minnesota where he played senior hockey. The NHL's 1967 expansion offered an opportunity to play for the newly founded North Stars, for whom he scored the first goal in the franchise's history.

Masterton's death sparked a long-running debate in hockey about the merits of wearing helmets, as few NHL players did so in that time. Despite several efforts to mandate their use, it was 11 years before the NHL made them compulsory for all new players beginning in the 1979–80 season. In his memory, the NHL created the Bill Masterton Memorial Trophy which it has awarded since 1968 to a player who demonstrates perseverance and dedication to hockey. The North Stars retired his jersey number 19, an honour that followed the franchise when it later relocated to Dallas, Texas.