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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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Tartan Name | Open Championship (1998) | | | Category | Corporate
| | | Designer | House of Edgar - Macnaughton Holdings Ltd. | STA Ref | 2575 | Date Recorded | Not Specified | STWR Ref | 2575 |
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Tartan Name | Open Championship, The | | | Category | Corporate
| | | Designer | Not Specified | STA Ref | none | Date Recorded | Not Specified | STWR Ref | 2803 |
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Tartan Name | Operation Encompass | | | Category | Corporate
| Reference | 11951 | Designer | Wilton, Brian | | | Date Recorded | 19/10/2017 | | |
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Tartan Name | Orange Fanaticos | | | Category | Corporate
| Reference | 10105 | Designer | Frankfort, David C | | | Date Recorded | 23/11/2009 | | |
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Tartan Name | Order of Saint Lazarus | | | Category | Corporate
| Reference | 11388 | Designer | Ross/Waterton-Anderson | | | Date Recorded | 14/10/2015 | | |
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Tartan Name | Order of the Holy Sepulchre | | | Category | Corporate
| | | Designer | Kinsey, Ronald Stuart | STA Ref | 2161 | Date Recorded | Not Specified | STWR Ref | 2161 |
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