Sean Donnelly (born April 1, 1993) is an American track and field athlete specializing in the hammer throw. He won a bronze medal at the 2019 Pan American Games. In addition, he represented the Americas at the 2018 IAAF Continental Cup. He graduated from Mount Union University in 2014 and continued his education to the University of Minnesota. His personal best in the event is 79.27 meters set in Tucson, Arizona in 2021.