Hansen or Hanssen refers to:

• Persons
  • Al Hansen (1927–1995), American artist
  • Alan Hansen (1955–), Scottish footballer
  • Ann Hansen (contemporary), Canadian anarchist and bomber
  • Ashia Hansen (1971–), British athlete, Olympic contestant
  • Beck Hansen, also known as Beck (1970–), American musician, songwriter
  • Bernie Hansen (contemporary), American politician in Chicago politics
  • Betsy Hansen (dates unknown), woman who charged actor Errol Flynn with statutory rape in 1942
  • Bjørn Bull-Hansen (1972–), Norwegian fantasy writer and former championship weightlifter
  • Bob Hansen (1961–), American basketballer
  • Carl Hansen (1872–1936), Danish author
  • Clifford Hansen (1912–), American politician from Wyoming
  • Colin Hansen (contemporary), Canadian politician from British Columbia
  • Constantin Hansen (1804–1880), Danish artist
  • Courtney Hansen (contemporary), American model and television personality
  • Craig Hansen (1983–), American professional baseball player
  • C. & V. Hansen (1906–2001 & 1900–1992), Danish comics authors
  • Dale Hansen (?–), American sportscaster
  • Dave Hansen (1947–), American politician from Wisconsin
  • David Hansen (contemporary), actor, director, and playwright
  • Derek Hansen (contemporary), Australian writer
  • Elaine Hansen (contemporary), president of Bates College
  • Emil Hansen (1842–1910), Danish fermentation physiologist
  • Erik Hansen (1965–), Norwegian author
  • Eva Hansen (1964–), Danish politician
  • Flemming Hansen (1939–), Danish politician
  • Gary Hansen (?–), American economist at UCLA
  • George V. Hansen (1930–), American politician, representative from Idaho
  • Gerhard Hansen (1841–1912), Norwegian physician, discover of the cause of leprosy
  • Glenna Hansen (1956–), Canadian Inuvialuit politician
  • Gunnar Hansen (1947–), Icelandic-American actor
  • Gus Hansen (contemporary), Danish professional poker player
  • Hans Hansen (1855–1936), Danish zoologist
  • Hans Hansen (1906–1960), Prime Minister of Denmark 1955–1960
  • Helmer Hanssen (1870–1956), Norwegian polar explorer
  • Ib Hansen, pseudonym of Austrian poet Hans C. Artmann (1921–2000)
  • James Hansen (1941–), American climate scientist
  • Jan Hansen (1971–), Danish athlete, Olympic contestant
  • Joachim Hansen (1930–), German actor
  • Joachim Hansen (1979–), Norwegian Mixed martial artist
  • John Hansen (contemporary), Scottish footballer
  • Joseph Hansen (1910–1979), American Trotskyist and leader of the American Socialist Workers Party
  • Joseph Hansen (1923–2004), Author
  • Julie Hansen (1890–1960), Danish astronomer
  • Kai Hansen (1963–), German power metal musician
  • Liane Hansen (contemporary), American radio journalist and radio show host
  • Martin Hansen (1972–), Danish badminton player, Olympic contestant
  • Mary Hansen (1966–2002), Australian guitarist and singer
  • Merle Hansen (1919–), Founder of the North American Farm Alliance
  • Per Hansen (1938–), Danish computer scientist
  • Per Hansen (1965–), Norwegian football coach
  • Percy Hansen (1890–1951), Danish recipient of the Victoria Cross
  • Peter Hansen (1795–1874), Danish astronomer
  • Peter Hansen (1921–), American actor
  • Peter Hansen (1941–), Danish UN official
  • Phil Hansen (dates unknown), American former football player
  • Rick Hansen (1957–), Canadian paraplegic athlete and humanitarian
  • Robert Hanssen (1944–), American FBI agent convicted of spying for Russia
  • Ron Hansen (1938–), American professional baseball player
  • Ron Hansen (1943–), Canadian politician from Ontario
  • Ron Hansen (1947–), American novelist, essayist, and professor
  • Stan Hansen (1949–), American professional wrestler
  • Baron Theophil von Hansen (1813–1891), Danish-Austrian architect
  • William W. Hansen (1909–1949), American physicist

• Fictional persons
  • Annika Hansen, character in the Star Trek universe (see Seven of Nine)