Oleydong Sithsamerchai (Thai: à ¹Âà ¸Âà ¹Âà ¸¥à ¹Âà ¸«à ¹Âà ¸Âà ¸ à ¸¨à ¸±à ¸Âà ¸Âà ¸´à ¹Âà ¹Âà ¸ªà ¸¡à ¸Âà ¸Âà ¸±à ¸¢; born July 17, 1985, in Tambon Ratsada, Huai Yot District (now Ratsada District), Trang Province) is a professional boxer from Thailand who has competed in the Strawweight and Super flyweight divisions. He is a former WBC Strawweight World Champion, having captured the title on November 29, 2007, by defeating Eagle Kyowa, a fellow Thai boxer based in Japan.
He became the first world champion from southern Thailand, as previous boxers from the region had challenged for world titles without success.
Sithsamerchai successfully defended his title for the third time on November 28, 2009, winning by majority decision over Juan Palacios. However, he lost the title on February 11, 2011, when he was knocked out by Kazuto Ioka.