Niels Nielsen (sailor)
Niels Marius Nielsen (5 October 1883 – 9 February 1961) was a Norwegian sailor who competed in the 1920 Summer Olympics. He was a crew member of the Norwegian boat Fornebo, which won the silver medal in the 7 metre class. References

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1883 births
1961 deaths
Norwegian male sailors (sport)
Sailors at the 1920 Summer Olympics – 7 Metre
Olympic sailors for Norway
Olympic silver medalists for Norway
Olympic medalists in sailing
Medalists at the 1920 Summer Olympics