Industries List
| Name | Province | City | |
|---|---|---|---|
| OLYMPIC COATERS INC. - Olympic Coaters Ltd. | Ontario | Etobicoke | |
| Olympic Kitchens Inc. - Olympic Kitchens Inc. | Ontario | Toronto | |
| OMEGA PROVOST 4-23-35-8 - Karve Energy Inc. | Alberta | Provost | |
| Omen Skaro 9-29 - C Group Energy Inc. | Alberta | Skaro | |
| OMEX Mfg ULC - OMEX Manufacturing ULC | Ontario | Stratford | |
| Onaping Falls - Sika Canada Inc. | Ontario | Dowling | |
| Oneida Quarry - NELSON AGGREGATE | Ontario | Hagersville | |
| Onion Lake Thermal 14-05-056-27W3 SKBT0016038 - IPC Canada Ltd. | Saskatchewan | Onion Lake | |
| Ontario Chrome Plating Inc. - Ontario Chromium Plating Inc. | Ontario | Oakville | |
| Ontario Trap Rock - R.W. TOMLINSON LIMITED | Ontario | Bruce Mines |
