William Marshall Mason (born 15 April 1980), also nicknamed "Big Willie", is a former professional rugby league footballer who played in the 2000s and 2010s. An Australia and Tonga international and New South Wales State of Origin representative forward, he played in the National Rugby League for the Canterbury-Bankstown Bulldogs (with whom he won the 2004 Grand Final and Clive Churchill Medal), the Sydney Roosters, the North Queensland Cowboys, the Newcastle Knights and the Manly-Warringah Sea Eagles. Mason also played in the Super League for English club Hull Kingston Rovers and French club, the Catalans Dragons. He also played rugby union in the Top 14 for French club RC Toulonnais. During his career Mason was involved in a number of controversial off-field incidents which have received media publicity due to his high profile in the NRL.
