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| Tartan Name | Tweedmouth Middle School | | | | Category | Corporate
| | | | Designer | Hek, Ronnie | STA Ref | 6740 | | Date Recorded | Not Specified | STWR Ref | 2906 |
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| Tartan Name | Tweedside Hunting | | | | Category | District
| | | | Designer | Unknown | STA Ref | 163 | | Date Recorded | Not Specified | STWR Ref | 163 |
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| Tartan Name | Tweedside Red | | | | Category | District
| | | | Designer | Wilsons of Bannockburn | STA Ref | 1175 | | Date Recorded | Not Specified | STWR Ref | 1175 |
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| Tartan Name | Tweedsmuir Dress (Dance) | | | | Category | Fashion
| | | | Designer | Dalgliesh, D C | STA Ref | 6568 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Twempy | | | | Category | Fashion
| | | | Designer | Hek, Ronnie | STA Ref | 6739 | | Date Recorded | Not Specified | STWR Ref | 2916 |
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| Tartan Name | Twenty First Century | | | | Category | Fashion
| | | | Designer | Geoffrey (Tailor) Highland Crafts | STA Ref | 2239 | | Date Recorded | Not Specified | STWR Ref | 2239 |
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| Tartan Name | Twilfit | | | | Category | Corporate
| Reference | 11101 | | Designer | Broberg, Göran | | | | Date Recorded | 05/08/2014 | | |
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| Tartan Name | Twisted Kilt Society | | | | Category | Corporate
| Reference | 11508 | | Designer | Wise, Atticus | | | | Date Recorded | 13/04/2016 | | |
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| Tartan Name | Tyndrum | | | | Category | District
| | | | Designer | MacIntyres, Mairi | STA Ref | 1128 | | Date Recorded | Not Specified | STWR Ref | 1128 |
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| Tartan Name | Tynecastle Park | | | | Category | Corporate
| Reference | 11960 | | Designer | Park, Ann | | | | Date Recorded | 30/10/2017 | | |
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| Tartan Name | Tyneside Scottish (Blue) | | | | Category | Military
| | | | Designer | Not Specified | STA Ref | 593 | | Date Recorded | Not Specified | STWR Ref | 593 |
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| Tartan Name | Tyrconnell (Personal) | | | | Category | Name
| | | | Designer | Geoffrey (Tailor) Highland Crafts | STA Ref | 2580 | | Date Recorded | Not Specified | STWR Ref | 2580 |
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| Tartan Name | Tyrone County, Crest Range | | | | Category | District
| | | | Designer | Viking Technology Limited | STA Ref | 7457 | | Date Recorded | Not Specified | STWR Ref | 3101 |
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| Tartan Name | Tyrone, County | | | | Category | District
| | | | Designer | House of Edgar - Macnaughton Holdings Ltd. | STA Ref | 2264 | | Date Recorded | Not Specified | STWR Ref | 2264 |
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| Tartan Name | U.S. 2001 Air Force | | | | Category | Military
| | | | Designer | Not Specified | STA Ref | 4089 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | U.S. Army | | | | Category | Corporate
| | | | Designer | Strathmore Woollen Company Ltd | STA Ref | 6307 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | U.S. Army (2023) | | | | Category | Military
| Reference | 14096 | | Designer | Paterson, Robert | | | | Date Recorded | 31/10/2023 | | |
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