Grete Waitz (née Andersen, 1 October 1953 – 19 April 2011) was a Norwegian marathon runner and former world record holder. In 1979, at the New York City Marathon, she became the first woman in history to run the marathon in under two and a half hours. Waitz won nine New York City Marathons, women's division, between 1978 and 1988, the highest number of victories in a single big city marathon in history. She won the silver medal at the 1984 Olympic Games in Los Angeles and a gold medal at the 1983 World Championships in Helsinki. She was also a five-time winner of the World Cross Country Championships.