Joanna Lynn Zakrzewski (known as Joasia or Jo, born 1976)[2] is an ultrarunner from Dumfries, Scotland.

[9] In February 2023, Zakrzewski set a world record of 255.7 miles (411.5 km) for a distance run in 48 hours,[10] although this was beaten the following month when Camille Herron ran 435.336 kilometres (270.505 mi) in the time.

She categorized herself as an "idiot" for accepting the award and blamed it on miscommunication as she claimed that she originally intended to withdraw from the race and hence took a car ride.

[13] However, the race director, Dwayne Drinkwater, rejected these claims noting that "After the event, there was no attempt by Joasia to make us aware of what had happened and to give us an opportunity to correct the results or return the third place trophy during the course of the subsequent seven days.

[14][15][16] Zakrzewski qualified in medicine at the University of Cambridge ( MB BChir 1999).