Ulf Artur Sundelin (born 26 August 1943) is a retired Swedish sailor. Together with his younger brothers Peter and Jörgen he won a gold medal in the 5.5 metre class at the 1968 Olympics and a silver medal at the 1969 World Championships. The brothers also won the 1971 world title in the three-person keelboat (Dragon class) and placed sixth at the 1972 Olympics.