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| Tartan Name | Iron Horse | | | | Category | Corporate
| | | | Designer | Ackerman/Stump | STA Ref | 3820 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Iron Snail, The - Navy | | | | Category | Fashion
| Reference | 14503 | | Designer | Goates, Sam; Woven In The Bone | | | | Date Recorded | 15/10/2024 | | |
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| Tartan Name | Ironside (Personal) | | | | Category | Name
| | | | Designer | Not Specified | STA Ref | 3990 | | Date Recorded | Not Specified | STWR Ref | 2845 |
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| Tartan Name | Iroquois Falls Centenary | | | | Category | Commemorative
| Reference | 10574 | | Designer | Chircoski, Côté & Deneault | | | | Date Recorded | 02/03/2012 | | |
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| Tartan Name | IRPA | | | | Category | Corporate
| Reference | 10602 | | Designer | Wilton, Brian | | | | Date Recorded | 23/04/2012 | | |
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| Tartan Name | Irvine of Drum | | | | Category | Clan/Family | | | | Designer | Not Specified | STA Ref | 733 | | Date Recorded | Not Specified | STWR Ref | 733 |
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| Tartan Name | Irving of Bonshaw | | | | Category | Clan/Family | | | | Designer | Scottish Tartans Society | STA Ref | 2609 | | Date Recorded | Not Specified | STWR Ref | 2609 |
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| Tartan Name | Isaia | | | | Category | Fashion
| Reference | 10330 | | Designer | Isaia, Gianluca | | | | Date Recorded | 22/12/2010 | | |
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| Tartan Name | Isla Grant (Personal) | | | | Category | Name
| | | | Designer | Lochcarron of Scotland | STA Ref | 5278 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Island Birth Surtsey | | | | Category | Fashion
| Reference | 12063 | | Designer | Martin, Carol A L | | | | Date Recorded | 20/02/2018 | | |
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| Tartan Name | Island Games Orkney 2025 | | | | Category | Commemorative
| Reference | 14847 | | Designer | Lochcarron of Scotland | | | | Date Recorded | 10/06/2025 | | |
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| Tartan Name | Island of Barbados | | | | Category | District
| Reference | 12888 | | Designer | Guibal, Robert Howarth | | | | Date Recorded | 28/07/2020 | | |
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| Tartan Name | Island of Innis, The | | | | Category | Fashion
| | | | Designer | Aljean of Vancouver | STA Ref | 5279 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Islander Dress | | | | Category | Fashion
| Reference | 10248 | | Designer | Bingham, Acacia | | | | Date Recorded | 21/07/2010 | | |
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| Tartan Name | Islay | | | | Category | Fashion
| | | | Designer | Edinburgh Woollen Mill | STA Ref | 5280 | | Date Recorded | Not Specified | STWR Ref | none |
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