Ratko Rudić (born 7 June 1948 in Belgrade, PR Serbia, FPR Yugoslavia) is a retired Croatian water polo coach and a former water polo player. As of 2015, he has won 38 medals as a coach at major events, making him the most successful water polo coach in history, and second most successful team sport coach of all time. He won four gold medals, of which three consecutive, with three different national teams at the Summer Olympics, as well as three gold medals with three national teams at the World Championships, among many others. In 2007 was inducted into the International Swimming Hall of Fame, described as "one of the best, if not the best, water polo coach to walk the deck of the pool".