Magne Hagen (born 25 January 1938) is a retired Norwegian royal servant.

Hagen started with a military career, and held the rank of lieutenant colonel. He was first hired in the Royal Court in 1974, as an aide-de-camp of King Olav V. He became private secretary in 1979.^[1] When Olav V died in 1991 and was replaced with Harald V, Hagen continued as private secretary.^[2] In the beginning of that year, it was noted that the entire court of the Norwegian royal family comprised as little as nine people: Hagen, Ingvald M. Smith-Kielland, Kaare Langlete, Ingegjerd Løvenskiold, Gunerius Flakstad and Barbara Iliff.^[3]

Hagen remained in his position until his retirement on 1 February 2000. Two days later he was summoned to a private audience with the king and queen, where he was decorated with the Grand Cross of the Royal Norwegian Order of St. Olav, a rare decoration for non-royals.^[1]

He is also a former leader of Norges Orienteringsforbund. He resides in Strømmen.^[4]