Nils Arne Eggen (17 September 1941 – 19 January 2022) was a Norwegian footballer, manager and teacher from Orkdal Municipality.

[1][2] In his native Trøndelag, Eggen is revered and widely regarded as the greatest and most influential sports person in the region, even eclipsing Olympic champions such as Hjalmar Andersen and Petter Northug.

[4] Eggen began his active football career when he was 15 years old as a defender at Orkdal's senior team.

Eggen was appointed Rosenborg's coach, together with Tor Røste Fossen, and in his first season (1971) they won "the double" for the first time ever in the club's history.

In the 1978 World Cup qualifiers, home wins over Sweden and Switzerland put Norway in contention for qualification.

During his spell as manager Rosenborg also won the Norwegian football cup a number of times.

He was again appointed by the club in November 2004 – this time as assistant manager/counsellor, a position he later stepped down from in 2005, when he admitted that his role hadn't worked as planned.

As a caretaker manager until Jan Jönsson was available to take over, Eggen led Rosenborg to their 22nd Norwegian top flight victory.

He was the father of Norway international footballer and manager Knut Torbjørn Eggen, who committed suicide in 2012.