Niels Arntzen Sem was a Norwegian politician.

He was elected to the Norwegian Parliament in 1825 and 1827, representing the constituency of Stavanger Amt. He worked as district stipendiary magistrate (sorenskriver) there.

In 1828 he was appointed County Governor of Buskeruds Amt. While stationed here, he was elected to the Norwegian Parliament in 1830. He moved on to be County Governor of Akershus Amt and Christiania Stiftamt in 1831 and County Governor of Lister og Mandals Amt in 1837. While stationed there, in Christianssand

Kristiansand

-History:As indicated by archeological findings in the city, the Kristiansand area has been settled at least since 400 AD. A royal farm is known to have been situated on Oddernes as early as 800, and the first church was built around 1040...

, he was to the Norwegian Parliament in 1842 and 1845.

In 1830 and 1845 he was President of the Storting, sharing the position with several people.

From 1846 to 1857 he was diocesan county governor of County Governor of Christiania Stiftamt. From October 1852 to 12 April 1853 he was an acting member of the Council of State Division in interim in Stockholm

Stockholm

Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...

, founded during King Oscar I

Oscar I of Sweden

Oscar I was King of Sweden and Norway from 1844 to his death. When, in August 1810, his father Jean-Baptiste Bernadotte was elected Crown Prince of Sweden, Oscar and his mother moved from Paris to Stockholm . Oscar's father was the first ruler of the current House of Bernadotte...

's illness.