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| Tartan Name | Ogilvy | | | | Category | Clan/Family | | | | Designer | Not Specified | STA Ref | none | | Date Recorded | Not Specified | STWR Ref | 287 |
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| Tartan Name | Ogilvy #2 | | | | Category | Clan/Family | | | | Designer | Caird of Dundee | STA Ref | 3240 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Ohio | | | | Category | District
| | | | Designer | Fischbach, Mary Jayne McMichael | STA Ref | 651 | | Date Recorded | Not Specified | STWR Ref | 651 |
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| Tartan Name | Oilmens | | | | Category | Corporate
| | | | Designer | Barkwell, Don | STA Ref | 3843 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Okanagan | | | | Category | District
| | | | Designer | Not Specified | STA Ref | 7700 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | OkieZarks | | | | Category | Fashion
| Reference | 15150 | | Designer | Jones, Russell E | | | | Date Recorded | 16/12/2025 | | |
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| Tartan Name | Oklahoma | | | | Category | District
| | | | Designer | Wittering/Murray | STA Ref | 2429 | | Date Recorded | Not Specified | STWR Ref | 2429 |
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| Tartan Name | Oklahoma State University | | | | Category | Corporate
| | | | Designer | Michalko, Stephanie | STA Ref | 7851 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Olann Aon Takihyo | | | | Category | Fashion
| Reference | 11898 | | Designer | Urquhart, Blair | | | | Date Recorded | 22/08/2017 | | |
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| Tartan Name | Olann DhĂ Takihyo | | | | Category | Fashion
| Reference | 11899 | | Designer | Urquhart, Blair | | | | Date Recorded | 22/08/2017 | | |
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| Tartan Name | Old Brigade | | | | Category | Corporate
| Reference | 10718 | | Designer | Rogers, James | | | | Date Recorded | 12/10/2012 | | |
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| Tartan Name | Old Capital | | | | Category | Fashion
| Reference | 12807 | | Designer | Ishii, Keiko | | | | Date Recorded | 31/03/2020 | | |
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| Tartan Name | Old England House Check | | | | Category | Fashion
| Reference | 11148 | | Designer | Joshua Ellis and Co Ltd | | | | Date Recorded | 23/10/2014 | | |
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| Tartan Name | Old Glory (1824) | | | | Category | Commemorative
| Reference | 11557 | | Designer | Sim, Steven Patrick | | | | Date Recorded | 14/06/2016 | | |
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| Tartan Name | Oliphant | | | | Category | Clan/Family | | | | Designer | Sobieski Stewarts, The | STA Ref | 242 | | Date Recorded | Not Specified | STWR Ref | 242 |
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