Airports
| Airport Name | Airport Code | Country |
|---|---|---|
| Ongiva | VPE | Angola |
| Oran | ORA | Argentina |
| Oscar Reguera | HOS | Argentina |
| Olavarria | OVR | Argentina |
| Ord River | ODR | Australia |
| Orientos | OXO | Australia |
| Oenpelli | OPI | Australia |
| Off Line Point | WGZ | Australia |
| Onslow | ONS | Australia |
| Oakey | OKY | Australia |
| Oodnadatta | ODD | Australia |
| Oban | OBA | Australia |
| Olympic Dam | OLP | Australia |
| Orbost | RBS | Australia |
| Ouyen | OYN | Australia |
| Off line Point | XZX | Australia |
| Off Line Point | WGF | Bahrain |
| Osmani International | ZYL | Bangladesh |
| Oostmalle | OBL | Belgium |
| Ostend/Bruges International Airport | OST | Belgium |