Lagi Setu (born 25 February 1988) is a Samoa international rugby league footballer.

Setu played 21 games for Brisbane in the 2009 NRL season as the club reached the preliminary final but were defeated 40-10 by Melbourne.

[4] In 2010, Setu announced he would be leaving the Brisbane Broncos to serve a two-year mission for the Church of Jesus Christ of Latter-day Saints in Birmingham, England starting in 2011.

[5] On 13 September 2012, Setu announced his return from his mission, signing a one-year contract with the Melbourne Storm starting in 2013.

[8][9] In 2008, Setu was named in the Samoan training squad for the 2008 Rugby League World Cup.