| Efnisorð | Verk |
|---|---|
| Ofsóknarkennd | 2 |
| Ofsóknir | 1 |
| Ofurhetjur | 5 |
| Ofurleiðni | 1 |
| Ofurmenni | 1 |
| Ofveiði | 1 |
| Ofvirkni | 5 |
| Ofþjálfun | 5 |
| Og enn spretta laukar (skáldsaga) | 1 |
| Oĭstrakh, David Fedorovich, 1908-1974 | 1 |
| Oil and gas wells | 1 |
| Oil consumption | 1 |
| Oil spills | 1 |
| Oil wells | 1 |
| Oittinen, Riitta | 1 |
| Ok | 1 |
| Okinawa Island (Japan) | 1 |
| Oksanen, Sofi, 1977- | 1 |
| Okur | 1 |
| OLAP technology | 1 |