Josh Cassidy (born November 15, 1984 in Ottawa, Ontario) is a Canadian wheelchair racer.
In 2010, Cassidy won the 2010 London Marathon with a time of 1:35:21 seconds.
In 2012, he won the 2012 Boston Marathon wheelchair race with a time of 1:18:25, which is the fastest wheelchair marathon time ever recorded, though won't count as a world record due to the Boston Marathon course being ineligible for world records.
Cassidy represented Canada at the 2008 Summer Paralympics, finishing 10th in the 5000m, 12th in the 1500m, and 17th in the 800m.
At the 2012 Summer Paralympics, Cassidy placed 12th in the marathon, 20th in the 5000m, 10th in the 1500m, and 5th in the 800m.In 2019, he won the 2019 Los Angeles Marathon.