John Jansen

John Jansen may refer to:

• John Jansen (rugby league) (born 1955), Australian rugby league footballer
• John Jansen (water polo) (born 1963), retired water polo player from the Netherlands
• Jon Jansen (born 1976), American football player

• John Jansen (politician) (born 1947), former mayor of Chilliwack, BC, and former member of British Columbia Legislative Assembly
• John Jansen (record producer), American recording engineer and music producer

• John Janssen (1835–1913), German-born American Roman Catholic bishop in Illinois
• Jonathan Janssen (born 1995), New Zealand basketball player