| The Web Guys | Auckland |
| The Website Shop | |
| The West Wing | Canterbury |
| The Workshop Auckland | Auckland |
| TheiaNova Ltd | |
| TheIntegrators.com | Wellington |
| Theta | Auckland |
| TheVirtual Ltd | Canterbury |
| TheWebCo | Auckland |
| Things Digital | |
| Think Forward Ltd | Wellington |
| Think IT Ltd | Auckland |
| Thinkspace (Auckland) | Auckland |
| This Side Up | Auckland |
| Thistle Tech Ltd | |
| Those Guys web development | Canterbury |
| Tier1 Technical Ltd | |
| Tierra Creative | Auckland |
| TimberSmart | Auckland |
| Timefiler | Canterbury |
| TimeHub Ltd | |
| Timey Ltd | Otago |
| TinSoldier Ltd | |
| Tiro Medical Ltd | |
| TL Parker | Canterbury |
| TLA Microsystems Ltd | Auckland |
| TME Digital Signature | Auckland |
| TMG Cloudland | |
| TNZ Group Ltd | Auckland |
| TNZI New Zealand Ltd | Wellington |
| Toast Ltd | Auckland |
| Toi Ohomai Institute of Technology | Bay of Plenty |
| Tomahawk | Auckland |
| Toniq Ltd | Canterbury |
| Tony's Computer Services | Canterbury |
| Tools2 U Software | Wellington |
| Top Flight | Auckland |
| Top Rank Digital | |
| Top Web Agency | |
| Topaz Solutions | Wellington |
| Topink Webstore | Auckland |
| Topnotch SEO | |
| Toptier | |
| TORO Technology | |
| Total computer services | Bay of Plenty |
| Total Computers | Auckland |
| Total Office Management Ltd | |
| Total Team | Canterbury |
| Totali Ltd | Bay of Plenty |
| Tracksuit Ltd | |