| Latin name | Vernacular name (AACR2 form) | Country code |
|---|---|---|
| Oeniponti* | Innsbruck (Austria) | au |
| Oerebroae | Örebro (Sweden) | sw |
| Olisipone
see Vlysipone |
||
| Olissipone
see Vlysipone |
||
| Olom.
see Olomucii |
||
| Olomucii* | Olomouc (Czech Republic) | xr |
| Olomuncii in Metropoli Morauiae
see Olomucii |
||
| Olomutii
see Olomucii |
||
| Olsnae* | Oels (Germany)
= Olesnica (Wroclaw, Poland) [both valid AACR2 headings] |
pl |
| Olsnae Silesiorum
see Olsnae |
||
| Olysipone
see Vlysipone |
||
| Olysippone
see Vlysipone |
||
| Olyssipone
see Vlysipone |
||
| Oppauiae* | Opava (Severomoravsky kraj, Czech Republic) | xr |
| Oppenheimii* | Oppenheim (Germany) | gw |
| Oppenheimio
see Oppenheimii |
||
| Oppenhomii
see Oppenheimii |
||
| Orcelis Bastitanorum
see Oriolae |
||
| Oriolae* | Orihuela (Spain) | sp |
| Oriolani
see Oriolae |
||
| Otthiniae* | Odense (Denmark) | dk |
| Oxon.
see Oxoniis |
||
| Oxoniae
see Oxoniis |
||
| Oxonias
see Oxoniis |
||
| Oxonii
see Oxoniis |
||
| Oxoniis* | Oxford (England) | enk |
| Oxonioe
see Oxoniis |
||
| Oxonni
see Oxoniis |