Ole Olsen (4 July 1850 – 4 November 1927)[1] was a Norwegian organist, composer, conductor and military musician.

His father was Iver Olsen, a craftsman and an amateur musician who played the organ at the local church.

He also studied composition and the organ from Fredrick and Just Lindeman, and sometimes substituted for Just as the organist in the Trondheim cathedral.

Another strong influence was the traditional Joik form of song, as he was involved in collecting folk tunes while in the military.

These influenced the large number of military marches he composed, and the nationalist tradition was also represented in his stage works.