Nils Peter Sundelin (born 13 January 1947) is a retired Swedish sailor. Together with his elder brothers Jörgen and Ulf 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 and ninth at the 1972 and 1976 Olympics, respectively.^[1]

Peter Sundelin

Peter (left), Jörgen and Ulf in 1968
Personal information
Full name	Nils Peter Sundelin
Nationality	Sweden
Born	(1947-01-13) 13 January 1947 (age 77) Nacka, Sweden
Height	191 cm (6 ft 3 in)
Weight	87 kg (192 lb)
Sailing career
Class(es)	5.5 metre, Dragon, Star, Soling
Club	Royal Swedish Yacht Club Skuru IK
Medal record Sailing Representing  Sweden Olympic Games 1968 Mexico City 5.5 m class World championships 1969 Sandhamn 5.5 m 1971 Hobart Dragon European championships 1978 Medemblik Star

Peter was the strongest physically among the Sundelin brothers.^[2] In the 1980s, he competed with different partners in the two-person keelboat at the 1980 Olympics and world championships. Besides sailing he played ice hockey for Skuru IK.^[2]