John Nielsen
John Nielsen may refer to:
- John Nielsen (footballer, born 1911)
- John Nielsen (footballer, born 1946), Danish player
- John Nielsen (footballer, born 1972), Danish player
- John Nielsen (racing driver) (born 1956), Danish auto racer
- John M. Nielson (born 1943), American minister in the Church of the Nazarene
- John Nielsen (born 1961), American nature writer and NPR science reporter, see National Outdoor Book Award
See also
- John Neilson (disambiguation)
- John Nielsen-Gammon (born 1962), American meteorologist, climatologist and academic
- Timothy John Nielsen (born 1968), English-born Australian first-class cricketer
- Nielsen (disambiguation)