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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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| Tartan Name | Oliphant Dress | | | | Category | Clan/Family | Reference | 10227 | | Designer | Oliphant/Urquhart | | | | Date Recorded | 16/06/2010 | | |
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| Tartan Name | Oliver Dress (Dance) | | | | Category | Fashion
| | | | Designer | Dalgliesh, D C | STA Ref | 5526 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Oliver Dress (Red) | | | | Category | Clan/Family | | | | Designer | Cargill, John | STA Ref | 1606 | | Date Recorded | Not Specified | STWR Ref | 1606 |
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| Tartan Name | Oliver Dress Pink | | | | Category | Clan/Family | | | | Designer | Cargill, John | STA Ref | 1259 | | Date Recorded | Not Specified | STWR Ref | 1259 |
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| Tartan Name | Oliver Hunting | | | | Category | Clan/Family | | | | Designer | Cargill, John | STA Ref | 126 | | Date Recorded | Not Specified | STWR Ref | 126 |
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| Tartan Name | Olympic | | | | Category | Corporate
| | | | Designer | Not Specified | STA Ref | 1923 | | Date Recorded | Not Specified | STWR Ref | 1923 |
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| Tartan Name | Olympicana | | | | Category | Commemorative
| | | | Designer | West Coast Woolen Mill | STA Ref | 5525 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | One Account | | | | Category | Corporate
| | | | Designer | Virgin One | STA Ref | 3912 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | One World Together | | | | Category | Other | Reference | 12827 | | Designer | Paterson, Robert & Campbell, Keri | | | | Date Recorded | 28/04/2020 | | |
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| Tartan Name | Oneness | | | | Category | Corporate
| Reference | 11102 | | Designer | Urquhart, Blair | | | | Date Recorded | 06/08/2014 | | |
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| Tartan Name | Ontario | | | | Category | District
| | | | Designer | Not Specified | STA Ref | none | | Date Recorded | Not Specified | STWR Ref | 2142 |
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| Tartan Name | Ontario (Official) | | | | Category | District
| | | | Designer | MacNeil, Jim | STA Ref | 6627 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Ontario Centennial | | | | Category | Fashion
| | | | Designer | Pik Mills? | STA Ref | 2038 | | Date Recorded | Not Specified | STWR Ref | 2038 |
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