** The Nielsen – Schreier theorem, that every subgroup of a free group is free.

** Leslie Nielsen, Canadian actor ( d. 2010 )

** Asta Nielsen, Danish silent film actress ( b. 1881 )

** XYY information booklet by Dr. Nielsen, a psychiatrist and geneticist who led the longest running of 7 international newborn screening studies of sex chromosome abnormalities.

** Ludolf Nielsen, composer ( died 1939 )

** won by the team of John Nielsen / Price Cobb / Martin Brundle driving a Jaguar XJR-12.

** Nielsen box for tracking television station watching

** Nielsen Media Research, the company that creates the Nielsen Ratings

** Nielsen Broadcast Data Systems, a service also known as BDS that tracks monitored radio, television and internet airplay of songs

** Nielsen Media Film Group – Official site ( Index page ) of host of ShoWest, ShoEast, and related film expositions ( conventions and trade shows )

** ShoWest – Official site published by Nielsen Media Film Group ( a division of Nielsen Business Media )

** Nielsen ratings, United States

** Erik Nielsen Whitehorse International Airport, YXY, 199, 594

** Triple X information booklet by Dr. Nielsen, a psychiatrist and geneticist who led the longest running of 8 international newborn screening studies of sex chromosome abnormalities.

** ICv2. com report that V for Vendetta is number one in Nielsen BookScan's list, ranked by sales, of graphic novels sold through book stores.