The first pipe organ was installed in the west gallery of the church in the spring of 1703 and was built by John Russell, a London-based organ builder, costing £200. It was not met with universal acclamation. One local lampoonist versified: “Arrived at the church, ’tis diverting to see Them all strut to Ned Kendall’s [the organist’s] vile twiddle dum dee, whose bass and whose treble, comparatively speaking, are like old pigs grunting and little pigs squeaking.”
After 95 years service with little maintenance, the organ was dismantled and sold and a contract for a new instrument was placed with London organ builder Hugh Russell in 1798.
In 1881, the second organ was in a bad state of repair and was sold and replaced by a three manual pipe organ built by Hele and Co. of Plymouth. This was situated in the Warrior Chapel (the southeast corner of the church).
By the 1970s the organ had deteriorated to such an extent that it was becoming unplayable and in January 1978, Lance Foy of Truro started work on a new instrument. In 1979 a new organ was installed using parts of the organ from the redundant church of St. Thomas, Bristol, and much of the Hele pipework from the previous organ. In 1993, the organ was rebuilt again by Lance Foy. A specification of the current organ can be found on the National Pipe Organ Register.