| Horizon-cumulus.ca | Quebec |
| Horizons Web Design | Ontario |
| Hornet Media | Ontario |
| Horning Corporation | Ontario |
| horoma AI | |
| Horus Information et Technologie | Quebec |
| Hoskin Scientific | |
| Host Bee Consulting | British Columbia |
| Host Here Domain Services, Inc. | Ontario |
| Host North | Ontario |
| Hosted FTP | Ontario |
| HostedinCanada | Alberta |
| HostIndex.com | British Columbia |
| Hosting Controller, Inc. | Ontario |
| Hosting Nation Data, Inc. | British Columbia |
| Hosting Support Guru | |
| Hosting.ca | British Columbia |
| HostingResolve.com | Ontario |
| HostLike.com | Ontario |
| Hostmds | Ontario |
| Hostopia.com, Inc. | Ontario |
| HostPapa, Inc. | Ontario |
| HostPapa.ca | Ontario |
| HostUtopia | British Columbia |
| Hot Rod Media | British Columbia |
| Hot Telecom | Quebec |
| Hot Tomali Communications | British Columbia |
| Hotbrain | |
| HotButton Solutions, Inc. | Alberta |
| Hothead Games | British Columbia |
| Hotspot Creative Solutions | |
| HotSpot Parking | |
| House of Stationery | |
| Houski, Inc. | |
| Hover | Ontario |
| Howbiz Soluions, Inc. | |
| Howell Data Systems | |
| Hpro Development | British Columbia |
| HQ Network Solutions | Ontario |
| HR Adwords Ltd | |
| HR Staffing | Ontario |
| HR Systems Strategires, Inc. | Ontario |
| HR Tech News | Ontario |
| HR Tech Summit | Ontario |
| HR.COM Ltd | |
| HRACAN IT Solutions | |
| HrFx Consulting, Inc. | |
| HRVST | |
| HRWARE Aperio | Ontario |
| HRWize | |