| Abbreviation | Definition |
|---|---|
| OLB | On- Line Bible |
| OLEM | Office for Lay Ecclesial Ministry |
| OLG | Our Lady Of Grace |
| OLG | Our Lady of the Greenwood Church |
| OLH | Our Lady of Humility Catholic School |
| OLH | Our Lady of the Hamptons |
| OLL | Our Lady Of Lourdes |
| OLL | Our Lady of the Lake Catholic Church, Holland, Michigan |
| OLM | On-Line Ministries |
| OLOM | Our Lady Of Medjugorje |
| OLOP | Our Lady of Peace Church |
| OLP | Our Lady of Peace Church |
| OLR | Our Lady of the Rosary |
| OLT | Our Life Together |
| OLTV | Orientale Lumen TeleVision |
| OLV | Our Lady of the Valley |
| OLV | Our Lady Of Victory |
| OLW | Our Lady of the Wayside |
| OM | Occult Material |
| OM | Old Monk |