Nong-O Gaiyanghadao (born November 10, 1986), formerly known as Nong-O Sit Or and Nong-O Gaiyanghadaogym, is a Muay Thai fighter currently signed to ONE Championship and is the reigning ONE Bantamweight Muay Thai World Champion. As of November 24, 2022, he is ranked #3 in the ONE Bantamweight Kickboxing rankings.