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Danielsen is a Nordic surname, originally meaning son of Daniel . Notable people with the surname include:
- Åge Danielsen (born 1942), Norwegian civil servant
- Anders Danielsen Lie (born 1979), Norwegian actor, musician and medical doctor
- André Danielsen (born 1985), Norwegian footballer
- Atli Danielsen (born 1983), Faroese footballer
- Dag Danielsen (born 1955), Norwegian politician
- Egil Danielsen (1933–2019), Norwegian javelin thrower
- Erling Danielsen (1922–2010), Norwegian politician
- Harry Danielsen (1936–2011), Norwegian educator and politician
- Henrik Danielsen (born 1966), Danish-Icelandic chess grandmaster
- Jan Werner Danielsen (1976–2006), Norwegian singer
- Joen Danielsen (1843–1926), Faroese poet
- John Danielsen (born 1939), Danish footballer
- Kristin Danielsen, Norwegian orienteering competitor
- Reidar Danielsen (1916–2000), Norwegian civil servant
- Rolf Danielsen (1922–2002), Norwegian historian
- Sean Danielsen American guitarist and vocalist for Smile Empty Soul and World Fire Brigade
- Steffan Danielsen (1922–1976), Faroese painter
- Victor Danielsen (1894–1961), first Faroese Bible translator and Plymouth Brethren missionary
- Vince Danielsen (born 1971), Canadian football player
- William Danielsen (1915–1989), Norwegian footballer
