| Nextsense International Ltd | Manufacturing | 2016 |
| NEZ Catering Oxford Ltd | Hospitality | 2026 |
| NGA Services Ltd | Information & communication | 2024 |
| Nguoi Saigon Ltd | Hospitality | 2025 |
| NHG Video Ltd | Information & communication | 2023 |
| NHN Group Ltd | Real estate | 2025 |
| NIA Consulting Ltd. | Information & communication | 2015 |
| Nice Rice Oxford Ltd | Hospitality | 2025 |
| Niche Vending Ltd | Wholesale & retail | 2024 |
| Nicholas Hunter Limited | Wholesale & retail | 1977 |
| Nicholas Jones Residential Limited | Real estate | 2015 |
| Nicholson Electrical Limited | Construction | 2008 |
| Nick Cope Music Ltd | Arts & recreation | 2022 |
| Nick Vane Associates Limited | Professional & scientific | 2020 |
| Nicklet Ltd | Professional & scientific | 2014 |
| Nicola Mardas Interiors Ltd | Professional & scientific | 2023 |
| Nicos Cleaning Services Ltd | Administrative & support | 2026 |
| Nicsunny Import & Export Co., Ltd | Wholesale & retail | 2023 |
| Nifty Dental Solutions Laboratory Ltd | Health & social care | 2024 |
| Nifty Property Management Ltd | Construction | 2020 |
| Nigel Hope Editorial Services Limited | Professional & scientific | 2002 |
| Nigel Nixon Consultancy Limited | Professional & scientific | 2001 |
| Night Nest Ltd | Hospitality | 2025 |
| Nightingale Care Solutions Limited | Health & social care | 2024 |
| Nikash Limited | Real estate | 2021 |
| Nikki Atkinson Limited | Administrative & support | 1998 |
| Nikki Van DER Gaag Associates Limited | Professional & scientific | 2007 |
| Nile Connect International Limited | Administrative & support | 2022 |
| Nimbloom Ltd | Information & communication | 2025 |
| Nimbusource Ltd | Information & communication | 2024 |
| Nimsa Solutions Limited | Information & communication | 2018 |
| Nine Osler Road Management Limited | Real estate | 2014 |
| Nineteenpoint Limited | Information & communication | 2013 |
| Ninja FOX Entertainments Ltd | Hospitality | 2025 |
| Niox Group PLC | Professional & scientific | 2006 |
| Niox Healthcare Limited | Wholesale & retail | 1998 |
| Niox Limited | Extraterritorial | 2024 |
| Nirima Ltd | Information & communication | 2017 |
| Nirvana Capital Ltd | Professional & scientific | 2023 |
| Niseko Health Limited | Professional & scientific | 2016 |
| Nishat (UK) Limited | Information & communication | 2014 |
| Nitsch Ltd | Construction | 2019 |
| Niujin Research Ltd | Information & communication | 2018 |
| Niva Business Solutions Limited | Information & communication | 2006 |
| Nivara Living Ltd | Real estate | 2025 |
| Nive Itech Limited | Information & communication | 2022 |
| NIX Carpentry Limited | Construction | 2022 |
| NJ Travels Ltd | Transport & logistics | 2025 |
| NJH Holdings Limited | Financial services | 2018 |
| NJJ Healthcare Ltd | Health & social care | 2019 |
| Njjb Properties Limited | Real estate | 2011 |
| Njokiwa Limited | Health & social care | 2016 |
| NJR Sailing Services Ltd | Arts & recreation | 2023 |
| NK Transport Oxford Ltd | Transport & logistics | 2026 |
| NMH Crowd Safety Management Ltd | Professional & scientific | 2015 |
| NN Mobile Tyres Ltd | Wholesale & retail | 2024 |
| NO Problema Ltd | Wholesale & retail | 2025 |
| NO Sky Blue Limited | Information & communication | 1995 |
| NO Stone Theatre Limited | Arts & recreation | 2018 |
| NO Time Productions Limited | Manufacturing | 2019 |
| NO. 1 the Gallery Limited | Health & social care | 2013 |
| NO1 Ship Street Ltd | Hospitality | 2017 |
| NOA Residence Ltd | Hospitality | 2015 |
| Noahsworth Limited | Real estate | 1945 |
| Noat MLK Ltd | Manufacturing | 2025 |
| Nobago Limited | Information & communication | 2012 |
| Nobebop Limited | Professional & scientific | 2006 |
| Noble Painting and Decorating Limited | Construction | 2024 |
| Nodan Limited | Construction | 2025 |
| Nofio Limited | Wholesale & retail | 2010 |
| Noke Recruitment Ltd | Administrative & support | 2019 |
| Noltc Trading Limited | Education | 2026 |
| Nomad Engineering Services Limited | Professional & scientific | 2025 |
| Nominet Limited | Extraterritorial | 2007 |
| Nominet Registrar Services Limited | Information & communication | 2012 |
| Nominet UK | Information & communication | 1996 |
| Nomo Skincare Limited | Manufacturing | 2025 |
| Nomsan Ltd | Professional & scientific | 2025 |
| None Other Studios Ltd | Wholesale & retail | 2026 |
| Noor Centre Limited | Manufacturing | 2024 |
| Noor Halimah Textile Ltd | Wholesale & retail | 2017 |
| Nora Properties Ltd | Real estate | 2026 |
| Norah's Antiques Ltd | Wholesale & retail | 2020 |
| Norgren Legal Limited | Professional & scientific | 2011 |
| Norham Gardens Lawn Tennis Club Ltd | Arts & recreation | 2026 |
| Norman J Gardner Consultants Ltd | Professional & scientific | 2026 |
| Normanv Global Limited | Professional & scientific | 2025 |
| Norris Scientific Ltd | Professional & scientific | 2025 |
| North Hinksey Parish Publications Limited | Information & communication | 2005 |
| North Insolvency Limited | Professional & scientific | 2017 |
| North Leigh Homes Ltd | Construction | 2026 |
| North Oxford Aesthetics Ltd | Other services | 2024 |
| North Oxford Consulting Ltd | Information & communication | 2023 |
| North Oxford Lawn Tennis Club | Education | 2025 |
| North Oxford Plastering Limited | Construction | 2020 |
| North Oxford Property Ltd | Real estate | 2025 |
| North Oxford Shared College Services Limited | Education | 2017 |
| North Oxford Sports Club Limited(The) | Arts & recreation | 1980 |
| North Oxford Therapy Services Limited | Health & social care | 2015 |
| North Parade Capital Ltd | Professional & scientific | 2021 |