Dominique Koster

Dominique Koster (born 3 January 1977) is a retired South African sprinter who specialized in the 400 metres.

Her biggest outing was the 2005 World Championships, where she competed on the South African 4 × 400 metres relay team. At the 2002 African Championships she finished seventh in the 200 metres and won a gold medal in the 4 × 100 metres relay.

Her personal best time was 53.97 seconds, achieved in April 2002 in Pretoria.