Keagan Girdlestone (born 30 April 1997) is a South African-New Zealand cyclist, who last rode for New Zealand amateur squad Team Frezzor Racing.

At the 2016 Coppa della Pace, Girdlestone crashed twice on a descent near Rimini, causing serious injuries. He was then transported to a hospital in critical condition. Due to this accident, the race was cancelled. Despite predictions by doctors that he would never race again, he competed in the 2017 Le Race (the event that he won in 2014) where he finished just inside the top 50.