Leslie Roy Mills CNZM MBE JP (born 1 November 1934) is a retired New Zealand track and field athlete and politician. He represented New Zealand at the Olympic Games and Commonwealth Games over two decades, competing in the shot put and discus throw. At the 1966 British Empire and Commonwealth Games he achieved his best result, a gold medal in the discus. Mills opened his first gym in 1968 and gives his name to Les Mills International, a company founded by his son Phillip Mills. He was Mayor of Auckland, New Zealand's largest city, from 1990 to 1998.