Nielsen (16 September 1868 – 1950) was a Norwegian businessperson.
He was born in Christiania.
He founded several companies, including Nielsen & Danielsen in 1897, and Norsk Gjærde & Metaldukfabrik, Scandinavia's first fence manufacturer, in 1902.
He had his own car dealer company C.
O.
Nielsens Automobilforretning, which was later transformed into A/S Auto.
Nielsen was the first general manager in A/S Auto, but later backed out.
He also co-founded the Royal Norwegian Automobile Club.
In 1916 he co-founded the company Neilson & Kittle Canning (also given as "Nielsen and Kittle") in San Pedro, California, a large sardine factory.
He later returned to Norway to run an eponymous company.He was an honorary member of the Norwegian Museum of Cultural History.