Colleen S. De Reuck (born 1964 in Vryheid, Kwazulu-Natal) is a long-distance runner from South Africa, who became an American citizen on 11 December 2000.

[1] Just ten days short of moving into the Masters division, she broke the 16-year-old Trials record, and defeated eventually Olympic bronze medalist, Deena Kastor in the process.

[3] De Reuck began competing for South Africa and made her first Olympic appearance at the 1992 Barcelona Games, where she finished ninth in the marathon race.

In 1996 she won the Lilac Bloomsday Run, the Berlin Marathon, and the Eurocross cross country meeting in Luxembourg.

The following year she finished in seventh place at the 2003 World Cross Country Championships, helping the U.S. team to the bronze medal.

[5] Just nine days earlier she had run 2:32:37 at the Twin Cities Marathon in St. Paul, Minnesota beating the listed American W45 record by over 6 minutes.

[7] Shortly after she ran in the Copenhagen Marathon in Denmark and placed 1st in 2:30:51, 8 minutes ahead of her nearest opponent.