Gundersen is a surname of Danish and Norwegian 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 (1924–2002), 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 (1934–2011), 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 (1929–1993), 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 Lauren Gunderson (born 1982), American playwright, screenwriter, and short story author Mia Gundersen (born 1961), Norwegian singer and actress 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