Halfdan Nicolaus Nielsen (26 March 1874 – 21 June 1952) was a Norwegian speedskater.
He was the second registered world record holder in 10,000 m, when he improved Oskar Fredriksen's record in Stockholm in 1893.
World record DisciplineTimeDateLocation10,000 m19.47,4February 13, 1893 Stockholm
Source: SpeedSkatingStats.com
References