Colleen S. De Reuck (born 13 April 1964 in Vryheid, Kwazulu-Natal) is a long-distance runner from South Africa, who became an American citizen on 11 December 2000. She has had a long-lasting career, running in her forties, and made a total of four appearances at the Summer Olympics. She continues to run and finished third at the Houston Half Marathon in 2009, finishing in 1:12:14.