| HART Industrial Communications, Inc. | Nova Scotia |
| Hart Systems | British Columbia |
| Harterra | |
| Hartman Communications | Ontario |
| Harvard Media | |
| Harvest Information Technology | |
| Harvest Venture Builders | Alberta |
| Hasbrown Interactive, Inc. | Ontario |
| HashChain Technology, Inc. | British Columbia |
| Hashtag Paid, Inc. | |
| Hashthink Technologies, Inc. | |
| Hasytem Tech, Inc. | Manitoba |
| Hatch Innovations Canada | |
| Hatch Ltd | |
| Hatchery | Ontario |
| Hatem+d | Quebec |
| Havas Montréal | Quebec |
| Have1.com | Ontario |
| Havers Design | British Columbia |
| HAVN Research, Inc. | |
| Hawk | New Brunswick |
| Hawk Host, Inc. | Ontario |
| Hawk Ridge Systems | |
| Hawkeye Software Solutions, Inc. | New Brunswick |
| Hax Digital | |
| Hay Communications Co-Operative Ltd | Ontario |
| Haya Solutions, Inc. | |
| Hayes Web & Digital Marketing | Ontario |
| Haylem, Inc. | |
| Hays Specialist Recruitment (Canada), Inc. | |
| Haystack | British Columbia |
| HB Studios Multimedia | Nova Scotia |
| HB Technology Solutions | |
| HBI Office Plus, Inc. | |
| HCI Consulting Inc. | |
| HCi3 Fund | |
| HCS Consulting Group | Alberta |
| HDAX Therapeutics | |
| HDD Recovery Services | Ontario |
| HDI Technologies | |
| HDTV Montréal | Quebec |
| HDTVandElectronics.com | Ontario |
| Headset Express | Ontario |
| Headset Factory | Alberta |
| Headway Systems Corporation | Alberta |
| Healix Computing | Ontario |
| Health Cities | |
| Health Data Research Network Canada | |
| Health Innovation Hub | Ontario |
| Health Myself Innovations, Inc. | |