| Abbreviation | Definition |
|---|---|
| NYI | Nazarene Youth International |
| NYJ | New York Journey |
| NYM | National Youth Ministries |
| NYP | NewYork Presbyterian |
| NYR | Nationwide Youth Roundup |
| NZC | New Zealand Catholic |
| NZCC | New Zealand Catholic Church |
| OAC | Overcome Any Challenge |
| OACF | Open Arms Christian Fellowship |
| OACM | Open Arms Christian Ministries |
| OACS | Ontario Alliance of Christian Schools |
| OACS | Osceola Adventist Christian School |
| OAD | Overall Dimensions |
| OAMC | Ohio Area Minister Conference |
| OASIS | Older Active Spiritually Inspired Singles |
| OBC | Olivet Baptist Church |
| OBC | Order of Buddhist Contemplatives |
| OBCA | Old Bethel Christian Academy |
| OBCA | Only Believe Christian Assembly |
| OBCC | Olive Branch Christian Church |