O Tannenbaum (Oh Christmas Tree) for SATB and Piano
by Glenn M. Carlos
O Vos Omnes for Soprano Solo and SATB
by David Friddle
O Ye That Embark in the Service of God for Medium or High Voice with Piano
by Deon Nielsen Price
October for SATB
by Kenneth Fuchs
Of Living Death and Dying Life for High Voice and Piano
by Paul Des Marais
Oh, Brillante Estrella! (Bright, Shining Star!) for SATB and Piano
by David Frank Long
Oh, Brillante Estrella! (Bright, Shining Star!) for TTBB and Piano
by David Frank Long
On His Blindness for TTBB A cappella
by John-Michael Albert
On Peace After War for Treble, SATB A&cappella
by Kent Carlson
One Special Life for SATB
by Steven Cooper
Open the Door (An Anthem) for SATB and Keyboard
by Timothy Brown
Opening Theme Fanfare for Brass Quintet 
by Thomas C. Baggaley
Oración Por la Paz (Pray for a Peace) for Piano and Electronic Music
by Arcangel C. Olivari
Other Wings for TTBB and Piano
by David Friddle
Ozma for Orchestra (2222/4221/perc/strings)
by Roger Bourland
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