The 1983 London Marathon was the third running of the annual marathon race in London, United Kingdom, which took place on Sunday, 17 April. The elite men's race was won by home athlete Mike Gratton in a time of 2:09:43 hours and the women's race was won by Norway's Grete Waitz in 2:25:29. Waitz's time was a marathon world record, yet it stood for only one day as it was beaten by Joan Benoit at the 1983 Boston Marathon.