| Nspec OIL UK Limited | Professional & scientific | 2005 |
| NSR Property and Tree Services Ltd | Administrative & support | 2021 |
| NSW Technology Ltd | Wholesale & retail | 2026 |
| Ntkg Ltd | Other services | 2008 |
| NU Bathrooms (Aberdeen) Limited | Construction | 2026 |
| Nu-Look PVC Systems Limited | Construction | 2005 |
| Nu-Style Products (Holdings) Limited | Other services | 2010 |
| Nu-Style Products Limited | Manufacturing | 1989 |
| Nubem Group Ltd | Wholesale & retail | 2025 |
| Nucliex Drilling Technologies Ltd | Professional & scientific | 2024 |
| Nucore Group Ltd. | Mining & quarrying | 2013 |
| Nude Hair and Beauty Ltd | Other services | 2023 |
| Nudge EMS Ltd | Professional & scientific | 2025 |
| Nuds Apparel Ltd | Wholesale & retail | 2023 |
| Nulab Limited | Administrative & support | 2021 |
| Number Seven Partnership Limited | Real estate | 2003 |
| Numismatics Limited | Real estate | 1993 |
| Nute Engineering Limited | Professional & scientific | 2026 |
| Nutrivive Ltd | Wholesale & retail | 2020 |
| Nuvo HR Limited | Administrative & support | 2019 |
| Nuvo Scotland Limited | Professional & scientific | 1994 |
| NV Subsea Limited | Professional & scientific | 2017 |
| NVE Subsea Services Limited | Professional & scientific | 2010 |
| Nvos Consultancy Ltd | Professional & scientific | 2017 |
| NXG Assets Limited | Administrative & support | 2016 |
| NXG Drilling Services Limited | Mining & quarrying | 2016 |
| NXG Global Group Limited | Professional & scientific | 2016 |
| NXG Holdco Limited | Financial services | 2025 |
| NXG International Limited | Mining & quarrying | 2017 |
| NXG Middle East Limited | Extraterritorial | 2018 |
| NXG Oilfield Services Limited | Mining & quarrying | 2017 |
| NXG Technologies Limited | Professional & scientific | 2018 |
| NXG Well Services Limited | Professional & scientific | 2017 |
| NY Skin Clinic Ltd | Health & social care | 2015 |
| NZD Logistics Limited | Professional & scientific | 2012 |
| Nztc Limited | Professional & scientific | 2021 |
| O & G Multiservice UK Ltd | Wholesale & retail | 2025 |
| O E Modifications Ltd | Administrative & support | 2021 |
| O Kitchen Aberdeen Limited | Hospitality | 2017 |
| O&G Premier Project Management Ltd | Professional & scientific | 2017 |
| O&L Engineering Services Ltd | Professional & scientific | 2012 |
| O'Balmers Limited | Professional & scientific | 2020 |
| O'Broin Offshore Services Limited | Mining & quarrying | 2010 |
| O'Kan Global Resourcing Limited | Construction | 2025 |
| O'Little Limited | Professional & scientific | 2023 |
| O'Malley Engineering Ltd | Administrative & support | 2013 |
| O'Neill PCS Ltd | Professional & scientific | 2022 |
| O.F Bakery (U.K) Ltd | Manufacturing | 2022 |
| O.F.R. Properties Limited | Real estate | 2020 |
| O.L.T. Group Ltd | Financial services | 2018 |
| O.P.E.(Uk) Limited | Professional & scientific | 2011 |
| O.U.I. (Scotland) Limited | Construction | 1998 |
| O.W. Projects Ltd | Professional & scientific | 2025 |
| O2 Worx Limited | Administrative & support | 2021 |
| OA & Co Property Management Ltd | Real estate | 2024 |
| Oak & Stone Properties Limited | Real estate | 2020 |
| Oak Root Properties Limited | Real estate | 2020 |
| Oak Venture Capital (Scotland) LLP | | 2011 |
| Oakfi Managements Limited | Wholesale & retail | 2022 |
| Oakhill Apartment Ltd | Hospitality | 2023 |
| Oakhill Corporate Limited | Real estate | 2015 |
| Oakhill Energy Ltd | Professional & scientific | 2026 |
| Oakhill Path Medics Ltd | Education | 2021 |
| Oakla Developments Ltd | Real estate | 2018 |
| Oaney Limited | Wholesale & retail | 2025 |
| Oasis Barbers Aberdeen Ltd | Other services | 2024 |
| Oasis Marine Ltd | Professional & scientific | 2013 |
| Oasons Verification & Inspection Ltd | Professional & scientific | 2015 |
| Oatyhill Limited | Professional & scientific | 2013 |
| Oberon Solutions Scotland Limited | Administrative & support | 2019 |
| OBM Limited | Other services | 2011 |
| Obreez Ltd | Transport & logistics | 2026 |
| OBS Engineering Limited | Professional & scientific | 2014 |
| Obsa Limited | Administrative & support | 2022 |
| Observant Systems Ltd | Information & communication | 2025 |
| Obsidian Resources Limited | Mining & quarrying | 2006 |
| Ocean Blue (Aberdeen) Limited | Agriculture & fishing | 2023 |
| Ocean Inspection Ltd | Professional & scientific | 2019 |
| Ocean Installer Crewing Limited | Mining & quarrying | 2012 |
| Ocean Installer Limited | Mining & quarrying | 2012 |
| Ocean Installer Surf UK Limited | Mining & quarrying | 2013 |
| Ocean Phoenix International Ltd | Professional & scientific | 2020 |
| Ocean SF Ltd | Agriculture & fishing | 1999 |
| Oceanedge Rigging Ltd | Professional & scientific | 2025 |
| Oceanic Flooring Ltd | Construction | 2024 |
| Oceanjack Limited | Professional & scientific | 2017 |
| Oceanrents Limited | Administrative & support | 2022 |
| Oceanscan Holdings Limited | Financial services | 1997 |
| Oceanscan Limited | Professional & scientific | 1989 |
| Oceansgate Group Limited | Administrative & support | 2022 |
| Oceansgate Holdings Limited | Extraterritorial | 2007 |
| Oceansgate Limited | Extraterritorial | 2007 |
| Oceanstar Engineering Limited | Professional & scientific | 2007 |
| Oceantechnic Limited | Mining & quarrying | 2025 |
| Oceantools Limited | Manufacturing | 1997 |
| Oceanum Ltd | Professional & scientific | 2013 |
| Oceanvalley Limited | Professional & scientific | 2001 |
| Oceanworx Ltd | Other services | 2011 |
| Ocek Engineering Limited | Professional & scientific | 2025 |
| Ocheph Consulting Ltd | Information & communication | 2022 |