| Efnisorð | Verk |
|---|---|
| Olíuverslun Íslands | 1 |
| Olíuvinnsla | 13 |
| Olkaria (Kenya) | 1 |
| Olnbogar | 1 |
| Olson, Eric T. | 1 |
| Olweus | 1 |
| Olweus, Dan | 1 |
| Olweusaráætlunin | 3 |
| Olympic Games | 1 |
| Olympic games | 1 |
| Olympics | 1 |
| Omega-3 fatty acids | 1 |
| Omega-3 fitusýrur | 1 |
| One-night stand | 1 |
| Online dating | 3 |
| Online identities | 1 |
| Online learning | 1 |
| Online media | 1 |
| Online social networks | 4 |
| Ono, Yoko, 1933- | 2 |
| Ontology | 1 |
| Open access | 1 |
| Open Global Glacier Model | 1 |
| Open source software | 4 |
| Operas | 5 |