Gundersen is a surname of Norwegian and Danish origin. Notable people with the surname include:
Adolf Gundersen (1865–1938), Norwegian-born American physician
Arnold Gundersen, (born 1949), American nuclear engineer and whistleblower
Bjørn Gundersen (born 1924), Norwegian high jumper
Dag Gundersen (1928–2016), Norwegian linguist and lexicographer
Einar 'Jeja' Gundersen (1896–1962), Norwegian footballer
Erik Gundersen (born 1959), Danish speedway rider
Fridtjof Frank Gundersen (born 1934), Norwegian law professor and politician for the Progress Party
Gunder Gundersen (1930–2005), Norwegian Nordic combined skier and sports official
Gunnar Gundersen (politician) (born 1956), Norwegian politician and Olympic swimmer
Gunnar Bull Gundersen (born 1929), Norwegian writer
Gunnar S. Gundersen (1921–1983), Norwegian modernist painter
Hans Jørgen G. Gundersen, Danish stereology researcher
Henry Gundersen, (1920–1945) Norwegian resistance member
Jacob Gundersen, Norwegian Olympic wrestler
Noah Gundersen (born 1989), singer/songwriter
Oscar Christian Gundersen (1908–1991), Norwegian politician for the Labour Party, twice Minister for Justice
Rudolf Gundersen (1879–1946), Norwegian speed skater
Trude Gundersen (born 1977), Norwegian Olympic medalist in taekwondo
