| Tartan Name | Category | Design Date |
| O Savaaoo | District
| Not Specified |
| O'Boyle | Clan/Family | 01/01/2003 |
| O'Brien | Name
| 01/01/1995 |
| O'Brien (Scotch Corner) | Fashion
| 01/01/2004 |
| O'Buckley (2017) | Name
| 12/04/2017 |
| O'Buckley, C (Personal) | Name
| 31/12/2021 |
| O'Connell, William Benedict (Personal) | Name
| 16/11/1997 |
| O'Connor | Clan/Family | 01/04/1994 |
| O'Connor / Ochiltree | Name
| 01/01/1988 |
| O'Connor Dress | Fashion
| 01/01/2004 |
| O'Connor, Hugh (Personal) | Name
| 27/11/2014 |
| O'Doherty (Glasgow) (Personal) | Name
| 08/09/2011 |
| O'Donnell-Cassidy, A & R (Personal) | Name
| 15/08/2023 |
| O'Donoghue | Fashion
| 01/01/2003 |
| O'Donohue | Clan/Family | 01/01/1963 |
| O'Farrell | Clan/Family | 01/01/1978 |
| O'Keefe | Clan/Family | 01/01/1978 |
| O'Kelly Family (Personal) | Name
| 17/04/1933 |
| O'Long (Personal) | Name
| 01/06/2007 |
| O'Mahony, The | Commemorative
| 01/11/2004 |
| O'Meehan | Clan/Family | Not Specified |
| O'Monaghan (Personal) | Name
| 01/01/2004 |
| O'Neill | Clan/Family | 01/01/2000 |
| O'Neill (Australia) | Clan/Family | 01/01/1998 |
| O'Neill Pipe Band 1983 | Corporate
| 01/01/1983 |
| O'Neill Pipe Band 1999/ Oliver dress | Corporate
| 01/01/2002 |
| O'Neill, Martin | Name
| 08/01/2004 |
| O'Neill, Red | Corporate
| 01/01/1985 |
| O'Raghallaigh, R & Family (Personal) | Name
| 19/08/2020 |
| O'Reilly (Estimated threadcount) | Fashion
| 01/01/2005 |
| O'Rourke (Estimated threadcount) | Fashion
| 01/01/2005 |
| O'Shaughnessy (Estimated threadcount) | Fashion
| 01/01/2005 |
| O'Shaughnessy Memorial | Corporate
| 01/01/2006 |
| O'Sheehan | Name
| 01/01/2007 |
| O'Sullivan | Clan/Family | 01/06/2000 |
| O'Sullivan McCragh (Personal) | Name
| Not Specified |
| O'Sullivan-Beare | Clan/Family | 01/01/2003 |
| O’Brien, P & Family (Personal) | Name
| 04/06/2023 |
| O’Brien, Scott (Personal) | Name
| 18/08/2019 |
| O’Neil-Mohabir, E & R (Personal) | Name
| 26/06/2022 |
| O2 (Personal) | Corporate
| 01/01/2007 |
| Oak Green | Fashion
| 30/01/2024 |
| Oakhall | Corporate
| 01/01/2004 |
| Oakland Centre | Corporate
| 06/05/2016 |
| Oakley (2015) | Name
| 03/03/2015 |
| Oakwood | Fashion
| 01/01/2002 |
| Obama Family | Commemorative
| 01/05/2017 |
| Oban | Fashion
| 01/01/1983 |
| Oban Grey | District
| Not Specified |
| Oban Mist | Fashion
| 06/01/2011 |
| Obradovic, Daniel & Family (Personal) | Name
| 05/06/2023 |
| Ocean Worlds & Icy Moons Exploration | Other | 18/04/2018 |
| Ochil Flora | Fashion
| 29/04/2020 |
| Ocho de Febrero | Fashion
| 25/05/2022 |
| Ochterlonie | Clan/Family | 01/01/2002 |
| OCLEES | Corporate
| 08/10/2020 |
| ODL | Corporate
| Not Specified |
| Ofally, County | District
| 01/01/1996 |
| Off Kilter Kilts | Corporate
| 20/07/2017 |
| Offaly County, Crest Range | District
| 01/05/2005 |
| Offer, Markus & Ritchie, George (Personal) | Name
| 03/03/2020 |
| Official Arbroath FC | Corporate
| 21/04/2023 |
| Official Dundee Utd FC (2022) | Corporate
| 19/05/2022 |
| Official Glasgow 2014, The | Corporate
| 14/02/2012 |
| Ofsharick, Matthew (Personal) | Name
| 12/01/2015 |
| Ogden, Thomas & Family (Personal) | Name
| 24/07/2021 |
| Ogg of Tarragann | Name
| 09/02/1994 |
| Ogg of Tarragann Hunting | Name
| 09/02/1994 |
| Ogilvie #1 | Clan/Family | 11/04/1816 |
| Ogilvie #2 | Clan/Family | 01/01/1930 |
| Ogilvie #3 | Clan/Family | 01/01/1893 |
| Ogilvie #6 | Clan/Family | 01/01/1930 |
| Ogilvie #7 | Clan/Family | 01/01/1900 |
| Ogilvie (Black and White) | Fashion
| 01/01/2002 |
| Ogilvie - 1831 | Clan/Family | 01/01/1831 |
| Ogilvie of Inverarity (Wilsons') / Ochterlonie | Clan/Family | 01/01/1840 |
| Ogilvie of Inverarity – VS #1 / Ochterlonie | Clan/Family | 01/01/1828 |
| Ogilvie of Inverarity – VS #2 | Clan/Family | 01/01/1828 |
| Ogilvy | Clan/Family | Not Specified |
| Ogilvy #2 | Clan/Family | Not Specified |
| Ogilvy or Drummond of Strathallen | Clan/Family | Not Specified |
| Ogle, Mary & Family (Personal) | Name
| 13/10/2022 |
| Ohio | District
| 01/01/1983 |
| Oilmens | Corporate
| Not Specified |
| Okada, Yayoi (Personal) | Name
| 12/10/2015 |
| Okanagan | District
| Not Specified |
| Okhai, K & Family (Personal) | Name
| 01/06/2020 |
| Oklahoma | District
| 01/03/1998 |
| Oklahoma State University | Corporate
| 01/01/2008 |
| Olann Aon Takihyo | Fashion
| 15/07/2017 |
| Olann Dhà Takihyo | Fashion
| 15/07/2017 |
| Old Aberdeen Diamond Jubilee | Fashion
| 01/01/2012 |
| Old Brigade | Corporate
| 08/10/2012 |
| Old Capital | Fashion
| 28/02/2020 |
| Old England House Check | Fashion
| 10/06/2014 |
| Old Glory (1824) | Commemorative
| 30/05/2016 |
| Oliphant | Clan/Family | 01/01/1842 |
| Oliphant Dress | Clan/Family | 05/05/2010 |
| Oliver Dress (Dance) | Fashion
| 01/01/2002 |
| Oliver Dress (Red) | Clan/Family | 01/01/1973 |
| Oliver Dress Pink | Clan/Family | 01/01/1973 |
| Oliver Hunting | Clan/Family | 01/01/1973 |
| Olympic | Corporate
| 01/01/1976 |
| Olympicana | Commemorative
| 01/01/1975 |
| Oman, Sultanate of / Oliver dress | Military
| 01/01/1960 |
| Omani Regiment 2nd Pipe Sqn. | Military
| 01/01/2006 |
| Omega Delta Sigma, National Veterans Fraternity | Corporate
| 10/11/2014 |
| One Account | Corporate
| Not Specified |
| One World Together | Other | 04/04/2020 |
| Oneness | Corporate
| 10/07/2014 |
| Onillon, Louis & Family (Personal) | Name
| 21/08/2019 |
| Ontario | District
| Not Specified |
| Ontario (Official) | District
| 01/01/1995 |
| Ontario Centennial | Fashion
| 01/01/1999 |
| Ontario Dental Association | Corporate
| 17/05/2021 |
| Ontario Provincial Police | Corporate
| 05/02/2009 |
| Ontario, Ensign of | District
| Not Specified |
| Ontario, Northern | District
| 01/01/2002 |
| Ontex | Corporate
| 03/08/2015 |
| Ooni Limited | Corporate
| 08/09/2022 |
| Oor Wullie (DC Thomson) | Corporate
| 01/08/2010 |
| Open Championship (1998) | Corporate
| 01/01/1998 |
| Open Championship (2000) | Corporate
| 01/01/2000 |
| Open Championship, The | Corporate
| 01/06/2001 |
| Open University in Scotland | Corporate
| 21/12/2022 |
| Operation Encompass | Corporate
| 12/09/2017 |
| Orange Fanaticos | Corporate
| 01/11/2009 |
| Orban-Prentice (Personal) | Name
| 01/01/2002 |
| Order of Saint Lazarus | Corporate
| 03/10/2015 |
| Order of the Fleur de Lys | Corporate
| 16/12/2019 |
| Order of the Griffin, Chestnut Hill College | Corporate
| 27/10/2021 |
| Order of the Holy Sepulchre | Corporate
| 01/01/1990 |
| Order of Vitéz | Corporate
| 07/10/2019 |
| Ordinariate, The | Corporate
| 09/06/2019 |
| Oregon State University | Corporate
| 01/08/2005 |
| Oregon, State of | District
| 01/12/2002 |
| Oren Peterson | Name
| 01/06/2009 |
| Organic | Fashion
| 11/12/2014 |
| Oriel #1 | District
| 01/01/1992 |
| Oriflame | Corporate
| 25/11/2013 |
| Orillia | District
| 06/04/2017 |
| Orion Nebula | Fashion
| 29/05/2012 |
| Orkney | Fashion
| 01/03/2000 |
| Orkney Heather | Fashion
| 01/09/2014 |
| Orkney Magnus | Fashion
| 20/10/2014 |
| Orkney Slate | Fashion
| 01/04/2011 |
| Orlando Dress, City of | District
| 01/01/2000 |
| Orlando Fire Department | Corporate
| Not Specified |
| Orlando Police Department | Corporate
| 01/01/2002 |
| Orlando, City of | District
| Not Specified |
| Orman (Midlothian) (Personal) | Name
| 26/07/2012 |
| Ormiston (Personal) | Name
| 10/1/2007 |
| Oromocto | District
| 01/01/1970 |
| Orr (2017) | Name
| 28/06/2017 |
| Orr Senior, Gerald William | Name
| 20/12/2011 |
| Orvis Sports Company | Corporate
| 01/01/2000 |
| Osborne, Charles (Personal) | Name
| 04/07/2018 |
| Osborne, Luke Alexander (Personal) | Name
| 16/01/2016 |
| OSCA Scotch College Melbourne | Corporate
| 05/03/2021 |
| Osgarby, David John & Gill, Benjamin Anthony (Personal) | Name
| 23/09/2023 |
| Oshidori (Mandarin Duck) | Fashion
| 22/04/2020 |
| Ostermeier (2015) | Name
| 19/07/2015 |
| Otago | District
| 01/01/1988 |
| Otago Peninsula | District
| 01/01/1996 |
| Ottawa | District
| 21/11/1967 |
| Ottinger, K & Family (Personal) | Name
| 10/01/2022 |
| Our Hero Scot | Corporate
| 13/11/2021 |
| Out & Proud (LGBTQIA+) | Fashion
| 28/06/2017 |
| Outlander #1 | Corporate
| 01/08/2014 |
| Outlander #2 | Corporate
| 01/08/2014 |
| Outlander #3 | Corporate
| 01/08/2014 |
| Outlander #4 | Corporate
| 01/08/2014 |
| Outlander #5 | Corporate
| 01/08/2014 |
| Outlander Vehicles | Corporate
| 29/10/2023 |
| Outlandish of the Southern Cross | Fashion
| 11/02/2020 |
| Outpost Club | Corporate
| 01/06/2015 |
| Over Mountain | Commemorative
| 01/01/1997 |
| Over the Sea to Skye | Fashion
| 01/05/2021 |
| Overgate | Corporate
| 23/08/2017 |
| Owen of Wales | Name
| 01/01/2002 |
| Ower, David & Stewart and Family (Personal) | Name
| 12/12/2023 |
| Owers, S & N, Melrose (Personal) | Name
| 24/03/2023 |
| Oxford University | Corporate
| 21/09/1999 |
| Oxford University Dress | Corporate
| 21/09/1999 |