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