| Trinidad State College | Colorado |
| Trinity Baptist College | Florida |
| Trinity Christian College | Illinois |
| Trinity College | Connecticut |
| Trinity College of Florida | Florida |
| Trinity Consultants | |
| Trinity Consulting, Inc. | Massachusetts |
| Trinity Health Michigan | |
| Trinity Insight, LLC | Pennsylvania |
| Trinity International University | Illinois |
| Trinity Network Solutions | Washington |
| Trinity School of Medicine | |
| Trinity Software Distribution | Florida |
| Trinity Software, Inc. | |
| Trinity Solutions, Inc. | North Carolina |
| Trinity Strategic Consulting, Inc. | North Carolina |
| Trinity University Computer Science | Texas |
| Trinity University Mathematics Department | Texas |
| Trinity Venture Capital | Oregon |
| Trinity Ventures | California |
| Trinity Washington University Information Technology, B.S. | District of Columbia |
| Trinity World | Michigan |
| Trinity3D | Missouri |
| Trinket, Inc. | |
| Trintech | Texas |
| Trinus Corporation | California |
| TrinWare | Colorado |
| TRIO | South Carolina |
| Trio | California |
| TRIO Pharmaceuticals | |
| Trio Solutions | South Carolina |
| Trio-Tech International | California |
| Triomics | New York |
| Trion Technology | Arizona |
| Trionfo Services, LLC | |
| Triopsy Medical, Inc. | Colorado |
| Triotel | South Dakota |
| Trip Loop | Texas |
| TripActions | California |
| TripAdvisor, LLC | Massachusetts |
| TriParish.net | Louisiana |
| Tripbam, Inc. | Texas |
| TripElephant, Inc. | |
| Tripika, Inc. | |
| TripIt | California |
| TriPixel, Inc. | Massachusetts |
| TriPlay, Inc. | New York |
| Triple A Internet Masters | California |
| Triple Crown Consulting | Texas |
| Triple D Computers, Inc. | Michigan |