Nathan Fien (born 1 August 1979), also known by the nickname of "Fieny", is a former New Zealand international rugby league footballer who played as a halfback, hooker and five-eighth in the 2000s and 2010s. He last played for the St. George Illawarra Dragons in the National Rugby League. A former Queensland State of Origin representative hooker, halfback or five-eighth, he previously played club football with the North Queensland Cowboys and New Zealand Warriors before moving to St. George in 2009.