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| Offbearer | | Term for one that works taking slabs and lumber away ... |
| Old growth | | Virgin timber.
-Growth in a mature forest ... |
| Open saw / Dished saw | | An open circular saw is one that is stretched too ... |
| Open-side carriage | | Skyline carriage that opens on one side allowing it to ... |
| Open-top van | | Van that can be loaded from above and is often ... |
| Operational cruise | | Timber inventory that includes the estimation of timber volumes or ... |
| Operator | | Owner or contractor of a logging operation.
-Person who operates a ... |
| Optimum road spacing | | Distance between parallel roads that gives the lowest combined cost ... |
| Out-of-shift repair time | | Part of nonoperating time during which a machine is actually ... |
| Outriggers | | Stabilizers that are generally found on knuckleboom loaders or mobile ... |
| Overmature | | Point at which timber has begun to lessen in commercial ... |
| Overrun | | Difference between the log scale of a shipment of timber ... |
| Overstory | | Layer of foliage in a forest canopy including the trees ... |
| Overstory removal | | Any silvicultural treatment with the desired end result being the ... |
| Overstory trees | | Trees that form the uppermost canopy layer in a forest ... |
| Ownership classes | |
County -Land owned by counties or land leased by them ... |
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