Women's race at the 2021 UCI Mountain Bike Marathon World Championships took place in Elba, Italy on 2 October 2021.

The 2021 XCM World Championship was held over a 35 km course with 2 laps plus an initial 2 km lap and a final 8 km lap.

In total, the women's race was 80 km with 3,100 metres.

[1][2] 50 competitors from 20 nations started.

[3] 40 competitors reached the finish line.