Laila Schou Nilsen (18 March 1919 – 30 July 1998) was a Norwegian speed skater, alpine skier and tennis player. She was one of the pioneers in Norwegian as well as international speed skating for women.

Nilsen is a surname of Norwegian origin, meaning "son of Nils". It refers to:

Anders Nilsen (Stavanger, (born June 23, 1988) is a Norwegian songwriter and music producer who became known with his dance tunes with a humorous touch.

Madelene Nilsen (born August 16, 1994) is a Instagram star.

Frode E. T. Nilsen (12 December 1923 – 29 June 2016) was a Norwegian diplomat and ambassador.

Ørjan Nilsen (Norwegian pronunciation: [ˈøːɾjɑn ˈniːlsn̩]; born 14 June 1982) is a Norwegian producer and DJ ranked inside the Top 250 DJs in his genre by the annual DJ Mag Top 100 poll . His debut studio album In My Opinion was released in 2011, followed by No Saint Out of Me in 2013 and Prism in 2018. His discography features collaborations with Armin van Buuren, Cosmic Gate, Fingerling among others.

Nils Nilsen Thune (27 May 1880 – 28 May 1950) was a Norwegian jurist and civil servant.

Nicolay William Nilsen (born 1944) is a Norwegian businessperson.

Nils Nilsen (born 29 December 1952) is a Norwegian former ice hockey player. He was born in Oslo, Norway and played for the club IF Frisk Asker. He played for the Norwegian national ice hockey team at the 1980 Winter Olympics.

Kirk Edward Nilsen II (born January 21, 1987) is a tattoo artist.