| John Nielsen | |
| Fullname: | John Schmidt Nielsen |
| Height: | 173cm |
| Birth Date: | 7 April 1972 |
| Birth Place: | Aarhus, Denmark |
| Position: | Midfield |
| Years1: | 1995–1996 |
| Years2: | 1996–1998 |
| Years3: | 1998 |
| Years4: | 1998–1999 |
| Years5: | 2000–2003 |
| Clubs3: | → Leiftur (loan) |
| Clubs5: | Skive IK |
| Caps1: | 19 |
| Caps2: | 29 |
| Caps3: | 15 |
| Caps4: | 8 |
| Caps6: | 19 |
| Goals1: | 0 |
| Goals2: | 3 |
| Goals3: | 0 |
| Goals4: | 0 |
John Schmidt Nielsen (born 7 April 1972) is a Danish former association football player, who played for Ikast and Viborg FF of the Danish Superliga. He moved abroad to play professionally for Southend United and Leiftur.[1]
In summer 1996 Nielsen was signed for Southend United by player-manager Ronnie Whelan. After being allowed to join Leiftur on loan, Nielsen was handed a free transfer by Southend's subsequent manager Alvin Martin.[2]