| Abbreviation | Definition |
|---|---|
| OKTC | Original Kids Theatre Company |
| OKTL | Orion Knit Textiles Limited |
| OKTL | Orion Knit Textiles Ltd |
| OKV | OKKWANG Valves |
| OKV | Openbaar Kunstbezit Vlaanderen |
| OKW | Otto Kuhlmann Company |
| OKZ | Opravy a Kovovýroba Záchlumí, A. S. |
| OLA | Oscar Larson & Associates |
| OLAF | One Life All Fit (Gym) |
| OLC | Ohlson Lavoie Corporation |
| OLC | Oriental Land Company |
| OLDC | Offaly Local Development Company |
| OLG | Ontario Lottery and Gaming (Corporation) |
| OLI | Omni- Lite Industries |
| OLI | Operation Lifesaver Inc |
| OLL | Overview & Longlook |
| OLLC | Offshore Limited Liability Company |
| OLM | On-Location Media, LLC |
| OLN | Oldham, Li Nie |
| OLO | On-Line Ordering |