Thai students won in the 30th International Olympiad in Informatics (IOI 2018) held in Tsukuba, Ibaraki prefecture, Japan. The silver medalist is Mr Sanchayaphol Liewkasemsant from Kamnoetvidya Science Academy of Rayong. The bronze medalists are Mr Thanadol Chomphuchan from Bunyawat Witthayalai School of Lampang, Mr Jirayu Burapacheep from Bangkok Christian College of Bangkok and Mr Milin Krotnongbua from Kamnoetvidya Science Academy of Rayong. The competition was held between 1-8 September. There were 335 students from 87 countries participated in this competition.