| The Settlement | Wellington |
| The Space InBetween | Auckland |
| The Web Company NZ Ltd | Auckland |
| The Web Guys | Auckland |
| The West Wing | Canterbury |
| The Workshop Auckland | Auckland |
| TheiaNova Ltd | |
| TheIntegrators.com | Wellington |
| Theta | Auckland |
| TheVirtual Ltd | Canterbury |
| TheWebCo | Auckland |
| Think Forward Ltd | Wellington |
| Think IT Ltd | Auckland |
| Thinkspace (Auckland) | Auckland |
| This Side Up | Auckland |
| Those Guys web development | Canterbury |
| Tierra Creative | Auckland |
| TimberSmart | Auckland |
| Timefiler | Canterbury |
| Timey Ltd | Otago |
| Tiro Medical Ltd | |
| TL Parker | Canterbury |
| TLA Microsystems Ltd | Auckland |
| TME Digital Signature | Auckland |
| 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 |
| Topaz Solutions | Wellington |
| Topink Webstore | Auckland |
| Total computer services | Bay of Plenty |
| Total Computers | Auckland |
| Total Team | Canterbury |
| Totali Ltd | Bay of Plenty |
| TradeWindow | Auckland |
| Transformative | Auckland |
| Tranzsoft | Auckland |
| Treehouse Networks Ltd | Waikato |
| Trench & Cable Ltd | Auckland |
| Treshna Enterprises Ltd | Canterbury |
| Trickstar web design | Hawke's Bay |
| Trineo | Canterbury |
| Trinity Bioactives Ltd | |
| Triode | Auckland |
| Triton Commercial Systems | Auckland |