Ole Olsen (4 July 1850 - 4 November 1927) was a Norwegian organist, composer, conductor and military musician. Olsen was born in Hammerfest, in the county of Finnmark. His mother died when he was young. His father was Iver Olsen, a craftsman and an amateur musician who played the organ at the local church. From a young age Olsen learnt to play the piano and the violin. At the age of five he composed his first small piece, and by the age of seven he sometimes stood in for his father playing the church pipe organ.