Jakob Nielsen
# Jakob Nielsen

Jacob or Jakob Nielsen may refer to:

* Jacob Nielsen, Count of Halland (died c. 1309), great grandson of Valdemar II of Denmark
* Jacob Nielsen (businessman) [no], Norway (1768-1822)
* Jakob Nielsen (mathematician) (1890–1959), Danish mathematician known for work on automorphisms of surfaces
* Jakob Nielsen (usability consultant) (born 1957), Danish web usability consultant
* Jakob Axel Nielsen (born 1967), Danish lawyer and politician
* Jakob Nielsen (actor) (1900-1978)
* Jacob Nielsen (cyclist) (born 1978), Danish cyclist
* Jakob Ahlmann Nielsen (born 1991), Danish footballer
