The chapel organ was built in 1935 by Casavant Frères of Sainte-Hyacinthe, Québec.  The instrument is the firm's opus 1506, and consists of 24 ranks of pipes.  The main organ and console are in the rear gallery, and there is a small echo organ above and to the left of the crucifix.  Several tonal changes have been made since the instrument's original installation.

Casavant Frères, Op. 1506

Great

8 Open Diapason
8 Spitz Flute
8 Flute Celeste (GG)
8 Dulciana
4 Principal
2 Principal
8 Clarinet
Tremulant

Echo

8 Chimney Flute
8 Muted Viol
8 Voix Celeste
8 Musette
Chimes
Tremulant

Swell

16 Gedeckt
8 Diapason
8 Stopped Diapason
8 Viole de Gambe
8 Voix Celeste
4 Principal
4 Traverse Flute
2-2/3 Nazard
8 Oboe (French)
Tremulant

Pedal

16 Major Bass
16 Bourdon
16 Gedeckt (Swell)
16 Echo Bourdon (ext. Echo)
8 Stopped Flute (ext.)