- Ragen Chastain
- 130.947 kilogram(s)
- United States (Sanford)
The heaviest person to complete a marathon (female) weighs 130.947 kg (288.68 lbs) and was achieved by Ragen Chastain (USA) at the Mainly Marathons race in Stanford, Maine, USA, on 14 May 2017.
After the marathon was completed, Ragen weighed 130.65 kg (288.03 lbs).