William M. Jennings (December 14, 1920 – August 17, 1981) was an executive in the National Hockey League.
He became a partner in a Manhattan law firm and through his capacity as counsel to Madison Square Garden, in 1962 he was named president of their main tenant, the New York Rangers.
He was a key figure in the first ever expansion of the NHL in 1967 when it doubled in size from the original six teams.
Jennings also helped initiate the Lester Patrick Trophy in 1966, which he would win in 1971.
In 1967, Jennings founded the Westchester Classic golf tournament in Harrison, New York as a means to raise funds for charitable purposes in Westchester County.