William Hopoate, Australian rugby league player
William Hopoate (born 9 May 1992), also known as Viliami in Tongan, also known by the nickname of "Hoppa", is a Tonga international rugby league footballer who plays as a centre, fullback and on the wing for the St Helens in the ESL.

He played for the Manly Warringah Sea Eagles, Parramatta Eels and Canterbury Bankstown Bulldogs in the National Rugby League. Hopoate has also played for New South Wales City and New South Wales in the State of Origin series.