Sarawut Masuk (Thai: ศราวุฒิ มาสุข), simply known as Nui (Thai: หนุ่ย) is a Thai professional football player who plays as a Winger for Thai Leagues 1 club Bangkok Glass and the Thailand national team.
Sarawut joined Muangthong United in 2012.
He made international debut for Thailand in friendly match against Jordan on 6 October 2011. He scored a goal against China for Thailand in a friendly match. He represented Thailand U23 in the 2013 Southeast Asian Games. Sarawut is also part of Thailand’s squad in the 2014 AFF Suzuki Cup. In May 2015, he was called up by Thailand to play in the 2018 FIFA World Cup qualification (AFC) against Vietnam.