This organ was originally a Forster & Andrews built onto the back wall of the church. However, when the present sanctuary was added, the instrument was moved into a newly built chamber. At that stage was almost identical in specification to the organ of St Philip & St James' Church, Booterstown. However, in 1993 Derek Verso carried out a major rebuild. The organ was taken out of the chamber and placed in the south transept of the church. New casework was carefully constructed, modeled on the original front paneling. Old dummy pipes (stored away after the moving of the old organ to the chamber) were added to make a new side-facade. A great number of new stops were added (mostly to the Pedal, which is now very developed) and a new console was built retaining the original keyboards. It features a combination system, rare for a parish organ and very useful for repertoire and liturgy. The finished instrument is a powerful, free-standing organ, unique and one of the finest two-manuals in Dublin, at least. In 2017/18 the organ went under major refurbishment carried out by the Wells Kennedy Partnership.
