Industries List
| Name | Province | City |
|---|---|---|
| Howe Sound Pulp and Paper Mill - Howe Sound Pulp & Paper Corporation | British Columbia | Port Mellon |
| Howmet Castings - Usine de Laval - Howmet Canada Company | Quebec | Laval |
| Howmet Georgetown Casting - Howmet Canada Company | Ontario | Georgetown |
| HP Polymers - HP Polymers | Ontario | Puslinch |
| HTI Hydraulic Technologies Inc - HTI Hydraulic Technologies Inc | British Columbia | Surrey |
| Huckleberry Mines Ltd. - Huckleberry Mines Ltd. | British Columbia | Houston |
| Hudson Bay OSB - Weyerhaeuser Company Limited | Saskatchewan | Hudson Bay |
| HUDSON PLATING - DELTA - Hudson Plating and Coating Co Ltd. | British Columbia | Delta |
| Hughenden FST - Secure Energy Services Inc. | Alberta | Hughenden |
| Humber Treatment Plant - City of Toronto | Ontario | Toronto |
