Sonya Hardcastle (born 16 April 1972) is a New Zealand former international netball player. An attacking midcourt player, Hardcastle was first selected for the New Zealand national netball team, the Silver Ferns, in 1992. She sustained a back injury the following year, which kept her out of the 1993 World Games. Outside of netball, Hardcastle was stalked several times during her early international career. After taking time out to focus on studies, Hardcastle rejoined the Silver Ferns in 1997, and went on to win silver medals at the 1998 Commonwealth Games and 1999 Netball World Championships.