Sharon Lee Stewart (born 17 August 1965) is a retired Australian middle-distance runner who specialised in the 800 metres. She represented her country at one outdoor and one indoor World Championships. In addition, she won the bronze medal at the 1990 Commonwealth Games. Her personal bests in the event are 2:00.17 outdoors (Oslo 1991) and 2:03.98 indoors (Seville 1991).