Industries List
| Name | Province | City |
|---|---|---|
| Oerlikon Metco (Canada) Inc. - Fort Saskatchewan Operations - Oerlikon Metco (Canada) Inc. | Alberta | Fort Saskatchewan |
| Oetiker Limited - Oetiker Ltd. | Ontario | Alliston |
| Ogden Point Quarry - CRH Canada Group Inc. | Ontario | Colborne |
| Oil Recovery Division - Safety-Kleen Canada Inc. [principal] | Ontario | Breslau |
| Ojay Comp Stn A-011-L - Canadian Natural Resources Limited | British Columbia | Tumbler Ridge |
| Ojay Comp Stn A-065-A - Canadian Natural Resources Limited | British Columbia | Tumbler Ridge |
| Ojay Comp Stn B-057-G - Canadian Natural Resources Limited | British Columbia | Tumbler Ridge |
| Ojay Comp Stn D-013-G - Canadian Natural Resources Limited | British Columbia | Tumbler Ridge |
| Ojibway Mine - Windsor Salt Ltd. | Ontario | Windsor |
| Okanagan Spring Brewery - Sleeman Breweries Ltd./Brasserie Sleeman Ltee. | British Columbia | Vernon |
