Seamus O'Connor (born October 4, 1997) is an American-born snowboarder, from Ramona, California, who competes internationally for Ireland. He competed for Ireland at the 2014 Winter Olympics in the men's halfpipe and men's slopestyle events. He was the Irish flag bearer in the opening ceremony of the 2018 Winter Olympics. Seamus finished in eighteenth place in the Men's halfpipe qualification at the 2018 Winter Olympics.