Kyros Vassaras (Greek: Κύρος Βασσάρας; born 1 February 1966) is a Greek former professional football referee. Vassaras is a linguist, being able to speak Greek, German, English and Spanish. Vassaras became a FIFA referee in 1998, and refereed his first senior international in 1999, in a match between Austria and San Marino. That same year, he was selected as one of the referees for the FIFA World U-17 Championships in New Zealand. He was named as a in 2004 and, since then, has officiated matches in the UEFA Champions League, the European Championships and the Olympic Games.