Wincatherine Nyambura Ndereba (born July 21, 1972) is a world class Kenyan marathon runner. She won the Boston Marathon four times and silver medals in the Olympics in 2004 and 2008. Ndereba broke the women's marathon world record in 2001, running 2:18:47 at the Chicago Marathon. In 2008, Ndereba was described by a Chicago Tribune sportswriter as the greatest women's marathoner of all time.
Ndereba is from Gatunganga in Nyeri District, and went to Ngorano Secondary School where she pursued her running career. In 1994, she was recruited into its athletics program by the Kenya Prisons Service . Ndereba was awarded the 2004 and 2005 Kenyan Sportswoman of the Year awards. She was awarded the Order of the Golden Warrior decoration by president Mwai Kibaki in 2005 .
She finished 7th at the 2009 London Marathon, equalling Katrin Dorre's record of 21 sub-2:30 hours marathons .