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| Tartan Name | Inverness Earl of | | | | Category | District
| | | | Designer | Stewart, D. C. | STA Ref | 1446 | | Date Recorded | Not Specified | STWR Ref | 1446 |
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| Tartan Name | Inverness Hunting | | | | Category | District
| | | | Designer | Not Specified | STA Ref | 3609 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Inverness, Earl of | | | | Category | District
| | | | Designer | Wilsons of Bannockburn | STA Ref | 1438 | | Date Recorded | Not Specified | STWR Ref | 1438 |
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| Tartan Name | Invertere (Daks #1) | | | | Category | Corporate
| | | | Designer | Bell, Arthur | STA Ref | 1540 | | Date Recorded | Not Specified | STWR Ref | 1540 |
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| Tartan Name | Invertere (Daks #2) | | | | Category | Fashion
| | | | Designer | Bell, Arthur | STA Ref | 1882 | | Date Recorded | Not Specified | STWR Ref | 1882 |
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| Tartan Name | Investing Women Ltd | | | | Category | Corporate
| Reference | 11698 | | Designer | Prickly Thistle Scotland Ltd | | | | Date Recorded | 25/01/2017 | | |
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| Tartan Name | Investors Group | | | | Category | Corporate
| | | | Designer | Kinloch Anderson Ltd | STA Ref | 6732 | | Date Recorded | Not Specified | STWR Ref | 3036 |
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| Tartan Name | Iona | | | | Category | Fashion
| | | | Designer | West Coast Woolen Mill | STA Ref | 6858 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Iona the Ragdoll | | | | Category | Fashion
| Reference | 13227 | | Designer | Tartan Caledonia | | | | Date Recorded | 13/07/2021 | | |
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| Tartan Name | Iowa | | | | Category | District
| | | | Designer | Osweiler, Mark | STA Ref | 6051 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Iowa Dress | | | | Category | District
| | | | Designer | Osweiler, Mark | STA Ref | 6382 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Iowa State University | | | | Category | Corporate
| Reference | 12620 | | Designer | Bunn, Madelyn | | | | Date Recorded | 18/09/2019 | | |
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| Tartan Name | Ireland's National | | | | Category | District
| | | | Designer | Viking Technology Limited | STA Ref | none | | Date Recorded | Not Specified | STWR Ref | 3072 |
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| Tartan Name | Irish American | | | | Category | Fashion
| | | | Designer | Viking Technology Ltd | STA Ref | 6104 | | Date Recorded | Not Specified | STWR Ref | 2965 |
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| Tartan Name | Irish Diaspora | | | | Category | Fashion
| | | | Designer | House of Edgar - Macnaughton Holdings Ltd. | STA Ref | 5827 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Irish Heritage | | | | Category | Fashion
| | | | Designer | Roeger III, William C | STA Ref | 7018 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Irish National | | | | Category | Fashion
| | | | Designer | House of Edgar - Macnaughton Holdings Ltd. | STA Ref | 2245 | | Date Recorded | Not Specified | STWR Ref | 2245 |
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| Tartan Name | Irn Bru | | | | Category | Corporate
| | | | Designer | Kinloch Anderson Ltd | STA Ref | 2395 | | Date Recorded | Not Specified | STWR Ref | 2395 |
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