Willemsen may refer to:
- August Willemsen (1936–2007), Dutch translator of Portuguese and Brazilian literature
- Daniël Willemsen (born 1975), Dutch sidecarcross rider and nine times World Champion
- Elfje Willemsen (born 1985), Belgian bobsledder who has competed since 2007
- Madeline Willemsen (1915–1982), Puerto Rican actress and comedian
- Marcel Willemsen (born 1977), Dutch sidecarcross passenger and 1999 World Champion
- Roger Willemsen (born 1955), German author, essayist and TV presenter
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