* John Kramer (darts player) (born 1956), retired American professional darts player
* John Kramer, better known as Jigsaw, fictional character in the ''Saw'' franchise
* John Kramer, bassist with the Arthur Lyman Group
* Jack Kramer (John Albert Kramer, 1921–2009), American tennis player
* John R. Kramer (1937–2006), former Tulane University Law School dean
* John H. Kramer, emeritus professor at Pennsylvania State University
* John Krämer, German writer
* John Kramer (footballer)