Jan Jansen

Jan Jansen may refer to:

• Jan Jansen (cyclist) (born 1945), Dutch cyclist
• Jan Jansen (historian) (born 1962), Dutch historian
• Jan B. Jansen (1898–1984), Norwegian professor of medicine
• Jan K. S. Jansen (1931–2011), Norwegian professor of medicine
• Jan Helge Jansen (born 1937), Norwegian politician
• Jan Jansen, a Baldur's Gate character