Industries List
| Name | Province | City | |
|---|---|---|---|
| Okotoks-High River Ready Mix - BURNCO Rock Products Ltd | Alberta | Okotoks | |
| Oland Brewery - Oland Brewery | Nova Scotia | Halifax | |
| Old Crow Power Plant - Yukon Electrical Company Limited | Yukon | Old Crow | |
| OLD DUTCH FOODS - CALGARY - Old Dutch Foods Canada | Alberta | Calgary | |
| Old Montreal Distillery - Sazerac Distillers of Canada Inc. | Quebec | Montréal | |
| Oldman 10-24 - Tourmaline Oil Corp | Alberta | Calgary | |
| Oldman 11-29 Compressor Station (NPRI) - Repsol Oil & Gas Canada Inc. | Alberta | Peers | |
| Olds - Premier Tech Home & Garden. | Alberta | Olds | |
| Olds - Richardson Pioneer Ltd. | Alberta | Olds | |
| Olds 06-09-032-01W5 GGS - Whitecap Resources Inc. | Alberta | Didsbury |
