Carl O. 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.[1] 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.[2] 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.[1]
He was an honorary member of the Norwegian Museum of Cultural History.[1] He was buried at Vestre gravlund in June 1950.[3]