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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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| | Tartan Name | Ontario Provincial Police |  |  |  | Category | Corporate | Reference | 10019 |  | Designer | Brown, David & Hall, Fiona |  |  |  | Date Recorded | 23/04/2009 |  |  | 
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| | Tartan Name | Ontario, Ensign of |  |  |  | Category | District |  |  |  | Designer | Rotex Ltd | STA Ref | 3140 |  | Date Recorded | Not Specified | STWR Ref | none | 
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| | Tartan Name | Ontario, Northern |  |  |  | Category | District |  |  |  | Designer | Teall/Smith | STA Ref | 956 |  | Date Recorded | Not Specified | STWR Ref | 956 | 
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| | Tartan Name | Ontex |  |  |  | Category | Corporate | Reference | 11358 |  | Designer | McCann/Urquhart |  |  |  | Date Recorded | 03/09/2015 |  |  | 
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| | Tartan Name | Ooni Limited |  |  |  | Category | Corporate | Reference | 13649 |  | Designer | Prickly Thistle Scotland Ltd |  |  |  | Date Recorded | 11/10/2022 |  |  | 
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