Niels Kristian Nielsen
 Not to be confused with his Danish teammate at the 1920 Summer Olympics Niels Erik Nielsen or with another Danish gymnast Niels Turin NielsenNiels Kristian Nielsen (January 10 1897 – April 12 1972) was a Danish gymnast who competed in the 1920 Summer Olympics.He was part of the Danish team which was able to win the silver medal in the gymnastics men's team Swedish system event in 1920.