Casavant Frères Ltée. Opus 1841, Pipe organ in Sydney, Nova Scotia, Canada

The Casavant Frères Opus 1841 is a pipe organ housed in Highland Arts Theatre in Sydney on Cape Breton Island, containing more than 2,000 pipes arranged across three manuals and pedal. The pipes vary greatly in size, from very small to quite large, combining to create a full range of sounds.

The organ originated in 1911 as Opus 452 for St. Andrew's Presbyterian Church. In 1946 it underwent major reconstruction with electrified mechanisms and became known as Opus 1841.

The organ's facade pipes are not merely decorative: 30 of them sound, and the instrument fills the theatre's apse. Before the building became an arts centre, St. Andrew's was considered perhaps Sydney's finest concert venue, and classical musicians held recitals there for its acoustics and the Casavant organ.

Visitors will hear the organ best during regular concert events at the theatre. Since it is a working concert instrument, checking the current schedule will help you plan the best time to experience it.

Thirty of the ornamental pipes on the theatre's apse facade are not decorative: they belong to the 8' Open Diapason of the Great Organ and sound. The organist Jean-François Mailhot of Sydney Mines cleaned the reed tongues and shallots of the Swell reeds and repaired one damaged facade pipe during a week's work in February 2017.