O
| Title | Composer/Arranger |
| O Gladsome Light | Unknown |
| Obsceje Voskresenije | Unknown |
| Oce Nas | Ivan Cankar |
| Oce Nas "Lord's Prayer" | V. Rev. A. Glagolev |
| The Lord's Prayer | Arr. Met. Danaskin |
| Otce Nas | Theo. Gorbacheff |
| Oce Nas | Michael Jovich |
| Oce Nas | J Marinkovich |
| Otche Nash | Rimsky, Korsakoff |
| Od Boke Do Splita | Unknown |
| The Offertory Litany | Unknown |
| Oj Badnjace, Badnjace | Dragi Cuculjevich Zuzuly |
| Oj Badnjace, Badnjace | Unknown |
| Oj Banijo | Ljubomir M Bosnjakovich |
| Oj Djurdjev-Dane | A. Kubek |
| Oj Moravo | Miroslav Leseticki |
| Oj More Duloko | Ljubomir M Bosnjakovich |
| Oj Srbijo | A. Sisfek, Arr. D. Bryak |
| O Kak Bezakonnoje | St. S. Mokranjac |
| Oko Serca | Unknown |
| Oko Serca Mojego | Mark Savich |
| Omladini | Isidor Bajic |
| Omonogenis Yios | Theo. Gorbacheff |
| Opelo I Parastos | St. S. Mokranjac |
| Orao Klice | Adam N Popovich |
| Osana | Smalenski |
| Osana | Molencki |
| Osma Rukovet | St. S. Mokranjac |
| Ot Junosti | Kosovo |
| Opelo | Fr. Nikolai Dazgich |