Carsten Tank Nielsen (18 December 1818 – 1 August 1892) was a Norwegian civil servant and government official. He was the first director of the Norwegian Telegraph ('' Telegrafverket'' now Telenor) from 1854 until his death in 1892. He and his wife Alvilde Olsen (1821–1890) were the parents of the historian and politician, Yngvar Nielsen.

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1818 births 1892 deaths Civil servants from Oslo Directors of government agencies of Norway Recipients of the St. Olav's Medal Order of the Dannebrog Order of the Polar Star Order of Vasa Burials at the Cemetery of Our Saviour {{Norway-bio-stub