Casey May Kopua ONZM (née Williams; born 19 June 1985) is a retired New Zealand international netball player and former captain of the New Zealand national netball team, the Silver Ferns, and the Waikato Bay of Plenty Magic. In domestic netball, Kopua played her entire career with the Waikato Bay of Plenty Magic, starting in 2003. During the 2008 ANZ Championship season, she was named the Holden Captiva player of the championship, winning a new car.