| Traidcraft Foundation |
| Traidcraft PLC |
| Transform Trade (formerly Traidcraft Exchange) |
| Transformedia Culture C.I.C |
| Travel Center Tunisia |
| Travis Perkins plc |
| Trek Bicycle Corporation |
| Triangle Arts Trust [ALSO: Triangle Network] |
| Triangle Wholefoods Collective Ltd (t/a Suma Wholefoods) |
| Trigger Productions Ltd |
| Trigger Stuff C.I.C. |
| Trimb Healthcare |
| Trina Solar Co., Ltd |
| Trinity College London |
| Triodos Bank NV |
| Triodos Bank UK Limited |
| Triodos Investment Management B.V. |
| Tripadvisor Inc. |
| Triple Line Consulting Limited |
| Tropic Skincare |
| Troya Kültür Dernegi |
| Trust for London |
| Trusted Nature Ltd |
| Truthpaste Ltd |
| TSB Bank Group plc |