Wellington's Anglican Cathedral has two service organs. The main organ is a large four manual and pedal instrument and the Lady Chapel is equipped with a small two-manual extension organ by J. W. Walker.The original organ was built by the English firm of T. C. Lewis and Company, and installed in Old St. Paul's in 1877. It was a fine example of that famous builder's work, and was a two-manual tracker blown by a water engine. The instrument was rebuilt and enlarged in the 1930s by Lawton and Osborne of Auckland. A new choir organ was added, and the tracker action was replaced by exhaust pneumatic.

In 1964 the organ was moved to the new Cathedral by George Croft and Son, Auckland where it served the cathedral music until 1976 when Crofts were entrusted with the work of rebuilding and enlarging the instrument to cathedral proportions. Every effort was made to retain the original "Lewis" sound and most of the original pipework was incorporated into the new organ. All new pipework was imported from England with the exception of the Pedal Bombarde unit, the Trompette en Chamade and the Great reeds which came from Germany. The organ now contains a total of 3,531 pipes.