William Osser Xavier Cook (October 8, 1895 – May 5, 1986) was a Canadian professional ice hockey right winger who played for the Saskatoon Crescents of the Western Canada Hockey League (WCHL) and the New York Rangers of the National Hockey League (NHL). A prolific scorer, Cook led the WCHL in goals twice and the NHL three times. He was named an all-star seven times between the two leagues. Known as "The Original Ranger", Cook was the first captain of the New York Rangers, scored the first goal in franchise history and led the team to two Stanley Cup championships.