Namesakes
Ingar Nielsen
(m) 1886-19xx 
Olympic Medalists 1920; 1924 sailing (gold)
Aksel Sandemose
(a.k.a. Nielsen) (m) 1899-1965
Notable Writers
Børge Raahauge Nielsen
(m) 1920-2010
Olympic Medalists 1948 rowing (bronze)
Leslie Nielsen
(m) 1926-2010
Notable Actors and Actresses
Peer Nielsen
(m) 1942-
Olympic Medalists 1964 canoe sprint (bronze)
Brigitte Nielsen
(f) 1963-
Notable Actors and Actresses
Connie Nielsen
(f) 1965-
Notable Actors and Actresses
Benny Nielsen
(m) 1966-
Olympic Medalists 1988 swimming - 200 m butterfly (silver)
Joachim Fischer Nielsen
(m) 1978-
Olympic Medalists 2012 badminton mixed doubles (bronze)