Gundersen is a surname. It may refer to:
- Bjørn Gundersen (born 1924), Norwegian high jumper
- 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 (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 stereologist
- Jacob Gundersen, Norwegian Olympic wrestler
- Mia Gundersen (born 1961), Norwegian actress
- 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