Lesley Simpson (née Brett; born 15 March 1968) is a former New Zealand rugby union player. She made her Black Ferns debut at RugbyFest 1990 against Netherlands. Brett competed at the 1991 Women's Rugby World Cup; she scored a hat-trick in their game against Wales.
Brett is the mother of former Crusaders and Blues fly-half, Stephen Brett. She was married to former All Black, Victor Simpson.