List of Famous people with last name Nielsen

Imre Rietveld is a retired Dutch-born Danish badminton player who won six French Open titles between 1963 and 1967. In 1967 she married Knud Aage Nielsen, a Danish badminton player. After that she competed for Denmark as Imre Rietveld Nielsen or Imre Nielsen, winning the Belgian International and Denmark Open in 1969, as well as a silver medal at the 1970 European Badminton Championships.

Jakob Nielsen was a Danish mathematician known for his work on automorphisms of surfaces. He was born in the village Mjels on the island of Als in North Schleswig, in modern-day Denmark. His mother died when he was 3, and in 1900 he went to live with his aunt and was enrolled in the Realgymnasium. In 1907 he was expelled for membership to an illicit student club. Nevertheless, he matriculated at the University of Kiel in 1908.

Elsa Nielsen is an Icelandic badminton player. She competed in women's singles at the 1992 Summer Olympics in Barcelona, and in women's singles at the 1996 Summer Olympics in Atlanta.