In 1877 the Kirk Session and congregation made a decision to introduce a musical instrument into the church as an aid to the service of praise. However it was not until March 1886 when inauguration of the organ took place, that instrumental music formed part of the service of praise. The cost of the organ was £506, a large part of which was again paid for by Alexander Whitelaw Esq. and his family.

The organ was built by Harrison and Harrison of Durham and is still in use today. It contains 1196 pipes with 3 couplers and 20 stops. The largest pipe in the organ is 5 m (15 feet) high and 450 mm (1foot 6 inches) in diameter approximately and the smallest pipe is the size of a pencil. The original position of the organ was against the west wall but it was decided in 1954 to build a pulpit in this position, so the organ was relocated to the north-west corner. In 2020 the console was relocated in the south-west corner to allow a disabled access lift to be installed. 
The pipes are located on the north-west corner of the balcony.