Nils Bertelsen

Niels Berhtelsen was a Norwegian sailor who competed in the 1912 Summer Olympics.
He was a crew member of the Norwegian boat Magda IX. Niels and his crew mates Alfred [Larsen (sailor)|Alfred Larsen], Johan Anker, Halfdan Hansen, Magnus Konow, Petter Larsen, Cristian Staib, Carl Thaulow, Arnfinn Heje and Eilert Falch-Lund all competed in the 1912 Summer Olympics winning a gold medal in the 12-metre class.
The eighteen sailors represented Norway in the nation's second appearance in sailing.
Niels and the crew completed the race in a time of 3:17:17, gaining them 7 points; in race two, they completed the race in 3:32:00, gaining another 7 points for the team. The team gained 7 points for the nation and finished first place, gaining the whole crew a gold medal each. These medals were also the first medal of any sort Norwegian sailors had won.