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| Tartan Name | Order of Vitéz | | | | Category | Corporate
| Reference | 12652 | | Designer | Wilton, Brian | | | | Date Recorded | 21/10/2019 | | |
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| Tartan Name | Ordinariate, The | | | | Category | Corporate
| Reference | 12554 | | Designer | Black, Ruth | | | | Date Recorded | 09/07/2019 | | |
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| Tartan Name | Oregon State University | | | | Category | Corporate
| Reference | 10131 | | Designer | Lorenson, Krisja | | | | Date Recorded | 19/01/2010 | | |
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| Tartan Name | Oregon, State of | | | | Category | District
| | | | Designer | Harding, Robert | STA Ref | 5743 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Oren Peterson | | | | Category | Name
| Reference | 10127 | | Designer | Mark A B Peterson | | | | Date Recorded | 11/01/2010 | | |
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| Tartan Name | Organic | | | | Category | Fashion
| Reference | 11379 | | Designer | Lochcarron of Scotland | | | | Date Recorded | 25/09/2015 | | |
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| Tartan Name | Oriel #1 | | | | Category | District
| | | | Designer | 'Smith Jnr, Dr Philip D | STA Ref | 2166 | | Date Recorded | Not Specified | STWR Ref | 2166 |
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| Tartan Name | Oriflame | | | | Category | Corporate
| Reference | 10961 | | Designer | Romare | | | | Date Recorded | 18/12/2013 | | |
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| Tartan Name | Orillia | | | | Category | District
| Reference | 11797 | | Designer | Waddell/Penny | | | | Date Recorded | 22/05/2017 | | |
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| Tartan Name | Orion Nebula | | | | Category | Fashion
| Reference | 10632 | | Designer | Arpin, Pierre | | | | Date Recorded | 12/06/2012 | | |
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| Tartan Name | Orkney | | | | Category | Fashion
| | | | Designer | Hek, Ronnie | STA Ref | 2681 | | Date Recorded | Not Specified | STWR Ref | 2681 |
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| Tartan Name | Orkney Heather | | | | Category | Fashion
| Reference | 11138 | | Designer | Ewing, Morag | | | | Date Recorded | 21/10/2014 | | |
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| Tartan Name | Orkney Magnus | | | | Category | Fashion
| Reference | 11158 | | Designer | Ewing, Morag | | | | Date Recorded | 03/11/2014 | | |
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| Tartan Name | Orkney Slate | | | | Category | Fashion
| Reference | 10440 | | Designer | Ewing, Morag | | | | Date Recorded | 22/06/2011 | | |
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| Tartan Name | Orlando Dress, City of | | | | Category | District
| | | | Designer | Brecheen, Eva | STA Ref | 6053 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Orlando Fire Department | | | | Category | Corporate
| | | | Designer | Brecheen, Eva | STA Ref | 3090 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Orlando Police Department | | | | Category | Corporate
| | | | Designer | Brecheen, Eva | STA Ref | 6054 | | Date Recorded | Not Specified | STWR Ref | none |
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| Tartan Name | Orlando, City of | | | | Category | District
| | | | Designer | Brecheen, Eva | STA Ref | 3045 | | Date Recorded | Not Specified | STWR Ref | none |
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