Industries List
| Name | Province | City |
|---|---|---|
| Oak Park - Sika Canada Inc. | Ontario | Brantford |
| OAKLAND COMP STN - TransCanada PipeLines Limited | Alberta | Rose Lynn |
| OAKVILLE - Procor Ltd. | Ontario | Oakville |
| Oakville South Terminal - Suncor Enery Products Partenership | Ontario | Oakville |
| Oakville Southeast Wastewater Treatment Plant - The Regional Municipality of Halton | Ontario | Oakville |
| Oakville Southwest Wastewater Treatment Plant - The Regional Municipality of Halton | Ontario | Oakville |
| OBA Diesel Generating Station - Hydro One Remote Communities Inc. | Ontario | OBA |
| Obed 01-21 - Tourmaline Oil Corp | Alberta | Calgary |
| Obsidian Compressor Station 03-02 - Obsidian Energy Ltd. | Alberta | Berrymoor |
| OChiese Comp Station 01-15 - Cenovus Energy Inc. | Alberta | Buck Creek |
