The architect brothers also designed the appearance of the church organ, and it was completed in 1975. The organ was made in Veikko Virtanen's organ-building workshop. The instrument features four keyboards and a pedal, 43 organ pipe rows (i.e. organ stops) and a total of 3,001 pipes. There is both a mechanical and electrical mechanism in the organ.

The organ is maintained annually and it's being played both at church services and concerts.

Music performed by:
Henri Hersta, Organist at Temppeliaukio Church