| Organised Space by ALI Ltd | Administrative & support | 2025 |
| Orgill Consulting Ltd | Professional & scientific | 2025 |
| Oriental BIT Ltd | Wholesale & retail | 2015 |
| Oriental Cleaning Services Ltd | Administrative & support | 2025 |
| Origin LAB Ltd | Wholesale & retail | 2022 |
| Originate Design Limited | Administrative & support | 2010 |
| Orium Global Resources Limited | Professional & scientific | 2023 |
| Orkney Line Limited | Transport & logistics | 1984 |
| Orla Daly Limited | Manufacturing | 2022 |
| Orlando's Family Ltd | Hospitality | 2024 |
| Ormiston Energy Ltd | Energy | 2015 |
| Ornate Lifestyle Ltd | Health & social care | 2025 |
| Ornum Technical Services Ltd. | Real estate | 1997 |
| Orphic Advisory Limited | Professional & scientific | 2017 |
| ORS Consulting (UK) Limited | Professional & scientific | 2016 |
| Orthogonal Ltd | Professional & scientific | 2020 |
| Orthopaedic and Sports Imaging Aberdeen Limited | Real estate | 2018 |
| Ortus Alba Limited | Professional & scientific | 2015 |
| Oses Aberdeen Ltd | Wholesale & retail | 2025 |
| Osiris Medical Imaging LLP | | 2006 |
| Oslo Blue Ltd | Real estate | 2023 |
| Osmans Cuts Ltd | Other services | 2019 |
| Osprey (Jacoba Maria) Ltd | Agriculture & fishing | 2017 |
| Osprey (PD147) Limited | Agriculture & fishing | 1998 |
| Osprey (PD156) Limited | Agriculture & fishing | 1998 |
| Osprey (PD357) Limited | Agriculture & fishing | 1998 |
| Osprey (PD43) Limited | Agriculture & fishing | 1998 |
| Osprey (PD63) Limited | Agriculture & fishing | 1998 |
| Osprey (PW447) Limited | Agriculture & fishing | 2002 |
| Osprey Aviation Services (UK) Ltd | Transport & logistics | 2014 |
| OSPREY3 Ltd | Manufacturing | 2000 |
| Ossipee Ltd. | Real estate | 1999 |
| Osso Holdings Limited | Financial services | 2019 |
| Osso Limited | Professional & scientific | 2003 |
| OT Cyber Consulting Ltd | Information & communication | 2023 |
| OT Insights Ltd | Professional & scientific | 2021 |
| OT Professional Services Ltd | Professional & scientific | 2023 |
| Otdc Limited | Health & social care | 2021 |
| Oteac Limited | Other services | 1984 |
| OTH Aberdeen Limited | Hospitality | 2016 |
| Otoo Training Ltd | Education | 2026 |
| Otpm Ltd | Construction | 2022 |
| OTT Energy Ltd | Administrative & support | 2022 |
| OTT Technology Ltd | Administrative & support | 2018 |
| OTT Well Data Ltd | Administrative & support | 2021 |
| Otter Rock Holdings Limited | Hospitality | 2026 |
| Otterburn Mills Limited | Wholesale & retail | 1989 |
| Ottogi Limited | Agriculture & fishing | 2025 |
| Ouma’S Kitchen Ltd | Hospitality | 2020 |
| OUT & Back Ltd | Wholesale & retail | 2024 |
| OUT After Dark Ltd | Arts & recreation | 2025 |
| Outceedo Ltd | Education | 2025 |
| Outfity Limited | Wholesale & retail | 2025 |
| Outline Event Services Ltd | Administrative & support | 2016 |
| Outline Visuals Ltd | Professional & scientific | 2023 |
| Outlines Creative C.I.C. | Arts & recreation | 2025 |
| Outside Inhouse Legal Limited | Mining & quarrying | 2017 |
| Outsource Solutions (Scotland) Limited | Administrative & support | 2019 |
| Oversea Aberdeen Ltd | Hospitality | 2024 |
| Overseas Assistance Solutions (Holdings) Limited | Professional & scientific | 2005 |
| Overton Automotive Limited | Extraterritorial | 1988 |
| Overworx Bars Ltd | Arts & recreation | 2019 |
| Overworx Distilling Co. Ltd | Transport & logistics | 2019 |
| Overworx Ltd | Other services | 2016 |
| Ovisha Traders Ltd | Wholesale & retail | 2018 |
| Owelfa Engineering Limited | Professional & scientific | 2025 |
| Ownedge Ltd | Information & communication | 2025 |
| Ownme Ltd | Wholesale & retail | 2025 |
| Oxygen Oban Ltd | Health & social care | 1989 |
| Ozall Ltd | Administrative & support | 2022 |
| Ozzy N Co Ltd | Administrative & support | 2023 |
| P & a Ettles & SON Timber Harvesting Ltd. | Administrative & support | 2003 |
| P & C Developments Ltd. | Construction | 2010 |
| P B Development Company Limited | Hospitality | 1986 |
| P Health Solutions & Co Ltd | Health & social care | 2020 |
| P Lockhead Investments Ltd | Real estate | 2025 |
| P Paterson Ltd | Mining & quarrying | 2010 |
| P Pizza Ltd | Hospitality | 2022 |
| P Pokora Services Limited | Construction | 2018 |
| P Property Group Ltd | Real estate | 2023 |
| P Rudd Consulting Limited | Professional & scientific | 2022 |
| P V Limited | Professional & scientific | 2001 |
| P W Utility Services Limited | Administrative & support | 2010 |
| P&M Associates Ltd | Professional & scientific | 2011 |
| P&P Enterprise Ltd | Wholesale & retail | 2022 |
| P. & S. Watt Limited | Real estate | 1975 |
| P.Nazaruk Services Ltd | Professional & scientific | 2020 |
| P3 Business Care C.I.C. | Professional & scientific | 2012 |
| P3R Aviation Ltd | Wholesale & retail | 2017 |
| P4 Training Limited | Arts & recreation | 2021 |
| P6 Performance Limited | Wholesale & retail | 2024 |
| Paaa Holdings Limited | Financial services | 2022 |
| Pabe Limited | Mining & quarrying | 2009 |
| Pack N Serve Ltd | Administrative & support | 2024 |
| Packed UP Limited | Administrative & support | 2021 |
| Packers Plus Energy Services (UK) Limited | Other services | 2009 |
| Paco's Food Ltd | Hospitality | 2018 |
| PAD Risk Consulting Limited | Mining & quarrying | 2017 |
| Pagia Limited | Wholesale & retail | 2025 |
| Paint My Lease Car Ltd | Wholesale & retail | 2018 |