John or Johnny Hansen may refer to:
Sports
- John Hansen (footballer, born 1924) (1924–1990), Danish Olympic footballer
- John Hansen (footballer, born 1950), Scottish footballer
- John Hansen (footballer, born 1973), Danish footballer
- John Hansen (footballer, born 1974), Faroese international footballer
- John Hansen (rower) (born 1938), Danish Olympic rower
- Johnny Hansen (footballer, born 1943), Danish international footballer
- Johnny Hansen (footballer, born 1964), Danish international footballer
- Johnny Hansen (footballer, born 1966), Danish international footballer
- Jonny Hanssen (footballer) (born 1972), Norwegian international footballer
- Jonny Hansen (footballer) (born 1981), Norwegian footballer
Other
- John Hansen (judge) (born 1945), New Zealand High Court Judge
- Johnny Hansen (musician) (born 1965), guitarist of Danish band Kandis
- John Hansen (voice actor), American voice actor
- John Hansen (Wisconsin politician) (1917–2015), Wisconsin politician
- John R. Hansen (1901–1974), U.S. Representative from Iowa
- John H.L. Hansen (born 1959), American speech technologist
- John P. Hansen (born 1943), Michigan politician