O
- O type - (Vehicle model)
- Ocean Liner - (Vehicle type)
- Ocean Terminal - (Vehicle type)
- Octopus - (Vehicle model)
- Ogle - (Vehicle make)
- Old Bill - (Vehicle model)
- Oldsmobile -
- Oldsmobile - (Vehicle make)
- Olympia - (Vehicle model)
- Opel - (Vehicle make)
- OSI - (Vehicle make)
- OSI 20 M TS - (Vehicle model)
- Otter - (Vehicle model)
- Overland - (Vehicle model)
- Oxford - (Vehicle model)