Sepp Kuss (born September 13, 1994) is an American professional cyclist from Durango, Colorado. He is the winner of the 2023 Vuelta a España, becoming the first American to do so since Chris Horner in 2013. Kuss currently rides for UCI WorldTeam Visma–Lease a Bike, where he has primarily served as a domestique. A talented climber, he has played a crucial role in helping team leaders Primož Roglič and Jonas Vingegaard secure a combined six Grand Tour victories. Throughout his career, Kuss has also achieved individual success, winning stages at both the Tour de France and Vuelta a España. He is one of only two riders to win a Grand Tour having finished all three Grand Tours in the same year.