Namesakes
Notable Actors and Entertainers:
4 actors
Asta Nielsen 1881-1972 
Leslie Nielsen 1926-2010
Brigitte Nielsen 1963-
Connie Nielsen 1965-
Notable Musicians:
1 singer
Sanna Nielsen 1984-
Notable Writers:
1 author
Aksel Sandemose (a.k.a. Nielsen) 1899-1965
Olympic Medalists:
3 bronze, 1 gold, 1 silver
(gold) Ingar Nielsen 1920; 1924 sailing
(bronze) Børge Raahauge Nielsen 1948 rowing
(bronze) Peer Nielsen 1964 canoe sprint
(silver) Benny Nielsen 1988 swimming - 200 m butterfly
(bronze) Joachim Fischer Nielsen 2012 badminton mixed doubles
Rock and Roll Hall-of-Famers:
1 musician
Rick Nielsen 2016 Cheap Trick