Halfdan Nielsen

{{short description|Norwegian speed skater}}

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.{{cite web | url=http://www.isu.org/vsite/vfile/page/fileurl/0,11040,4844-181536-198754-94643-0-file,00.pdf | work=International Skating Union | title=Speed Skating. Complete history list of World Records | publisher= | access-date=18 February 2009 | url-status=dead | archive-url=https://web.archive.org/web/20120205184935/http://www.isu.org/vsite/vfile/page/fileurl/0,11040,4844-181536-198754-94643-0-file,00.pdf | archive-date=5 February 2012 | df= }}