Political organisations
O
| Name | Type | Notes |
|---|---|---|
| Odd Fellow | Miscellaneous | |
| One World | Pressure group | |
| Orange Institute | Religious | |
| Orange Order | Miscellaneous | |
| Overseas League | Miscellaneous | |
| Oxfam | Pressure group |
| Name | Type | Notes |
|---|---|---|
| Odd Fellow | Miscellaneous | |
| One World | Pressure group | |
| Orange Institute | Religious | |
| Orange Order | Miscellaneous | |
| Overseas League | Miscellaneous | |
| Oxfam | Pressure group |