Complete BIC Category Listing
| Occult Studies | HRQX | x3 |
| Occult Studies: Magic, Alchemy & Hermetic Thought | HRQX2 | x1 |
| Occult Studies: Witchcraft | HRQX5 | x6 |
| Occultism & Quasi-Religious Beliefs | HRQW | x2 |
| Occupational / Industrial Health & Safety | KNXC | x2 |
| Occupational Medicine | MMRP | x0 |
| Occupational Therapy | MQT | x0 |
| Oceanography (seas) | RBKC | x4 |
| Oceans & Seas | YLGL91 | x1 |
| Offenders | JBVP | x10 |
| Office & Clerical Skills | YVN | x3 |
| Office & Workplace | KMV | x2 |
| Office Management | KMVD | x4 |
| Office Systems & Equipment | KMVH | x0 |
| Offshore Engineering | TTSH | x0 |
| Old Catholics | HRBD2 | x0 |
| Old Testament | HRBM1 | x1 |
| Olympic Games | YWSB1 | x1 |
| Oman | 1FBXM | x1 |
| Oncology | MJCL | x4 |
