Tanawat Phonnaku, also known as Inthanon Sithchamuang (born: January, 12 1987 in Sakon Nakhon province), is a Thai professional boxer.
He lost to Kohei Kono for the World Boxing Association world super flyweight world title.
Phonnaku holds a defeat by Jerwin Ancajas and Mark Anthony Geraldo.
In November 2016, Hirofumi Mukai defeated world title contender Tanawat Phonnaku to claim Tso’s vacated WBO Asia-Pacific Junior Bantamweight title.