Cosmin Alexandru Radu (born November 9, 1981) is a former Romanian professional water polo player who is currently vice-president of the Romanian Waterpolo Federation. He has played for , Rapid Bucharest, Rari Nantes Florentia, Primorje Rijeka, HAVK Mladost. He was also the captain of Romania's national team for 12 years from 2009 until the end of his professional career.