William Joseph Hassett (October 21, 1921 – November 15, 1992) was an American professional basketball player.

He won an NBA championship with the Lakers in 1950 with teammate George Mikan.

Hassett played for the AAU Dow Chemics in 1944 after Georgetown dropped basketball due to World War II.

Hassett managed the 24 second clock the first time it was used in the NBA at a Syracuse Nationals game.

[2] His brother, John Aloysious "Buddy" Hassett, played Major League Baseball for the Brooklyn Dodgers, the Boston Bees and Braves and the New York Yankees (1936–1942).