Uaine Fa Junior (born 19 October 1989) is a New Zealand professional boxer.
He has held the Interim WBO Oriental Heavyweight title since June 2018 but was promoted to full champion in July 2019.
As an amateur he represented Tonga at the 2010 Commonwealth Games, winning a bronze medal in the super-heavyweight division; he also represented Tonga at the Oceania Championships, winning gold and multiple silver medals.
As of February 2017, Fa is ranked as the world's 57th best heavyweight by BoxRec, and currently, boasts a 62% knockout-to-win ratio.
Fa had a successful amateur career, from beating Joseph Parker to competing at consecutive Commonwealth Games and Oceania Championships and being one of New Zealand's national champions.
Fa made his professional debut in 2016 when he defeated Richard Tutaki in a first-round knockout.
The following year he went on to become the New Zealand's professional heavyweight champion, preceding Sonny Bill Williams.