| Highland Communications Technologies | Ontario |
| Highland Multimedia | Nova Scotia |
| Highline Beta | |
| Highmark Innovations, Inc. | |
| Highrise Community Network | Ontario |
| Highside Software | Ontario |
| HighSpeedSat Satellite Systems | Ontario |
| Hiilite | British Columbia |
| Hilary Little | Ontario |
| Hilgartner Software | |
| Hilight Projects | British Columbia |
| Hill+Knowlton Strategies | |
| Hillside Systems | Ontario |
| HILO | |
| HILO Solutions, Inc. | |
| Him & Her, Inc. | Ontario |
| hind-smith.com, Inc. | Ontario |
| Hipo | |
| Hippocampus Consulting, Inc. | |
| Hiqsoft | Alberta |
| Hire Technologies | |
| Hired | |
| HireFX, Inc. | Ontario |
| Hireground Software | |
| HireH Consulting | |
| Hirescope | |
| HireTheWorld | British Columbia |
| HiRide Share Ltd | |
| Hisense Canada | |
| Hispanotech | |
| Hitachi High-Technologies Canada, Inc. | Ontario |
| Hitachi ID Systems, Inc. | Alberta |
| Hitachi in Canada | Ontario |
| Hitachi Systems Security, Inc. | Quebec |
| Hitech Communications Ltd | Newfoundland and Labrador |
| Hitek Computer Systems | Ontario |
| Hits-Me, Inc. | Ontario |
| Hive Blockchain Technologies Ltd | British Columbia |
| HiVE Vancouver | |
| Hive.co | |
| Hivestack | |
| Hka data processing corporation | Ontario |
| HKA Technologies, Inc. | Ontario |
| HLB System Solutions | Ontario |
| HLF Images | British Columbia |
| HM Tech | |
| HM Tech Solutions | |
| HMK Consultants | Ontario |
| HMS Software | Quebec |
| Hobo Computer Services | Ontario |