John Madsen

John Madsen may refer to:


 * John Madsen (American football) (born 1983), American football player
 * John Madsen (footballer) (born 1937), Danish association football player
 * John Madsen (physicist) (1879–1969), Sir John Percival Vissing Madsen, Australian academic, physicist, engineer and mathematician
 * John M. Madsen (born 1939), American leader in The Church of Jesus Christ of Latter-day Saints