| HAL 9000 Systems (Pty) Ltd | Gauteng |
| Hamonate | Gauteng |
| HandMade Connections CC | |
| Hashtag South Africa | Gauteng |
| Hawk Mobile | |
| HB IT Solutions | Western Cape |
| HeliosDesign | Gauteng |
| Hellocomputer | Gauteng |
| Henley Business School South Africa | |
| Herotel | Western Cape |
| Hetjou! Web Design | |
| HG Bosch & Associates | Gauteng |
| Hi-Q Electronics | Western Cape |
| Hi-Tech Recruitment | Gauteng |
| HiFiCorp | |
| High Tech Impressions (Pty) Ltd | Gauteng |
| HKWeb | Gauteng |
| Hole-In-One Business Solutions | Gauteng |
| Holomatrix | KwaZulu-Natal |
| Home PC | Gauteng |
| Hominum | |
| Hooligan Development | |
| Hospitality Solutions | Western Cape |
| Host4Africa.com | Gauteng |
| Hostingkzn | KwaZulu-Natal |
| Hostitworld | KwaZulu-Natal |
| Hostking | |
| HostworX | |
| Hotwireless | Gauteng |
| HP South Africa | Gauteng |
| HP Store South Africa | Gauteng |
| HSBC South Africa | |
| HSC Systems | Gauteng |
| HSG-Solutions | |
| HTI (Pty) Ltd | Gauteng |
| htxt.africa | Gauteng |
| Hub Host | Western Cape |
| Huge Networks | Western Cape |
| Huge Telecom | Gauteng |
| Human Sciences Research Council | |
| HybridClouds | Western Cape |
| Hymax | Western Cape |
| HyperionDev | Western Cape |
| Hypertext | |
| Hyrax Biosciences | Western Cape |
| i-Consulting | Western Cape |
| I-Soft Solutions (Pty) Ltd | Western Cape |
| I-Systems | Gauteng |
| i-TEAM (Pty) Ltd | Gauteng |
| I-Tech Solutions | KwaZulu-Natal |