O
- OD GREEN
- OPS
- OSO Sweet
- Oak
- Oil
- Olive
- Olive Wood
- Omni
- One
- Onion
- Only
- Onyx EDC
- Open Season
- Open Season Skinner
- Orange
- Orange Camo
- Organizer
- Osborne
- Outdoor
- Outfitter
- Outrider
- oasis linerlock knife
- od-2
- old timer knives
- old timer pocket knife
- old timer ramrod 3-blade
- omni hunter
- one hand
- onion blur
- onion knife
- onion leek
- onslaught
- ontario 8846 rat
- onyx edc knife
- onyx replacement blades
- open assisted knife
- open season folding knifes
- open season folding skinner knife
- opener
- opening
- orange emergency emt ems rescue handy medical pocket knife
- orange emt
- orange handle
- orange knife
- order
- osborne 928 proxy
- osborne barrage
- osborne carbon fiber
- oso sweet 1830 folding pocket knife
- oso sweet knife
- ouroboros
- outdoor knife
- outdoorman lite
- oval
- oyster knife
