Grete Waitz (née Andersen, October 1, 1953 – April 19, 2011) was a Norwegian marathon runner and former world record holder.
In 1979, she became the first woman in history to run the marathon in under two and a half hours. She won nine New York City Marathons between 1978 and 1988, more than any other runner in history. She won a silver medal at the 1984 Olympic Games in Los Angeles and a gold medal at the 1983 World Championships in Helsinki. Her other marathon victories included winning the London Marathon in 1983 and 1986. She was also a five-time winner of the World Cross Country Championships.