Billy Slater, Australian rugby league player
William Slater (born 18 June 1983), is an Australian former professional rugby league footballer who played in the 2000s and 2010s. An Australian international and one-time captain of the Queensland State of Origin team, he played his entire club career in the National Rugby League for the Melbourne Storm, with whom he played in seven NRL Grand Finals. Slater also set the club's record for most ever tries and NRL record for most ever tries by a fullback.

Slater amassed 190 NRL tries for the Melbourne Storm, which is the second most in an Australian first-grade career, behind Ken Irvine. Slater also won two premierships, the Clive Churchill Medal twice and the Dally M Medal with the Storm. With the Kangaroos he was the 2008 World Cup's top try-scorer and player of the tournament and won the 2008 Golden Boot Award as the World player of the year. Slater was also the winner of the television game show Australia's Greatest Athlete in 2009 and 2010.