| N.A.Lighton Limited | Arts & recreation | 2011 |
| N.Davis & Son(Dairies)Limited | Agriculture & fishing | 1965 |
| N.E.Salmon Limited | Agriculture & fishing | 1957 |
| N.G.T.E Limited | Professional & scientific | 2018 |
| Nash Green Property Management Ltd | Real estate | 2015 |
| Nationwide Food Packing Limited | Hospitality | 1990 |
| Nationwide Pallet Racking Services Ltd | Manufacturing | 2018 |
| Naturally Sophie Ltd | Wholesale & retail | 2023 |
| Natures Nook Day Nursery Ltd | Health & social care | 2025 |
| NAW Electrical Engineering Ltd | Construction | 2021 |
| Ncfa Global Limited | Other services | 2026 |
| NDW & Co Holdings Ltd | Financial services | 2020 |
| NDW Labour Supply Limited | Administrative & support | 2008 |
| Neomys Limited | Information & communication | 2013 |
| Networking Limited | Information & communication | 1996 |
| Nevill Properties Limited | Households | 2025 |
| Nevill's Holdings Limited | Financial services | 2025 |
| Newberys Ltd | Administrative & support | 2016 |
| Newcastle Elite Academy Ltd | Arts & recreation | 2017 |
| News Direct (Norfolk) Limited | Information & communication | 2011 |
| Newstar Bakery Limited | Wholesale & retail | 2009 |
| Next in Line Esports Ltd | Arts & recreation | 2022 |
| Nexus Property Investments Ltd | Real estate | 2015 |
| NFH Classic Cars Ltd | Wholesale & retail | 2021 |
| Nicola Calvert Ltd | Wholesale & retail | 2019 |
| Nigel Barnett Artist Blacksmith Ltd | Manufacturing | 2013 |
| Nigel Scholes Consulting Limited | Information & communication | 2020 |
| NO Fear Tech Ltd | Information & communication | 2025 |
| Noon Projects Ltd | Professional & scientific | 2024 |
| Norfine Nets Limited | Manufacturing | 2006 |
| Norfolk Aero Structures Limited | Transport & logistics | 2013 |
| Norfolk Bespoke Finishes Ltd | Extraterritorial | 2026 |
| Norfolk Building and Design Ltd | Professional & scientific | 2026 |
| Norfolk Churches Trust Limited (the) | Arts & recreation | 1976 |
| Norfolk Circular Mushroom Enterprise CIC | Agriculture & fishing | 2026 |
| Norfolk Cleaning Solutions Ltd | Administrative & support | 2022 |
| Norfolk Commercials Limited | Wholesale & retail | 2014 |
| Norfolk Cottage Spas Limited | Hospitality | 2024 |
| Norfolk County Catering Limited | Hospitality | 2023 |
| Norfolk DRY Wall (Essex) Limited | Construction | 2001 |
| Norfolk DRY Wall Limited | Construction | 1989 |
| Norfolk Dunes Ltd | Households | 2018 |
| Norfolk Fire Group Ltd | Professional & scientific | 2022 |
| Norfolk Game Supplies Ltd | Wholesale & retail | 2015 |
| Norfolk Glazing Solutions Ltd | Construction | 2025 |
| Norfolk Heating & Cooling Ltd | Construction | 2026 |
| Norfolk Home Renovations Ltd | Construction | 2021 |
| Norfolk Popcorn Company Ltd | Manufacturing | 2012 |
| Norfolk Skylights Ltd | Construction | 2018 |
| Norfolk Stump Grinding Ltd | Administrative & support | 2018 |
| Norfolk Stump Removal Ltd | Agriculture & fishing | 2022 |
| Norfolk Trees Limited | Agriculture & fishing | 2017 |
| Norfolk Wills and Estate Planning Ltd | Financial services | 2016 |
| Norfolk Woods & Hedges Limited | Administrative & support | 2002 |
| Norfolk's Vantastic Movers Ltd | Transport & logistics | 2021 |
| Norman Wenn Ltd | Water & waste | 2012 |
| North Norfolk Signs Limited | Other services | 2002 |
| North Tuddenham Garage Ltd | Wholesale & retail | 2003 |
| North Zambia Holdings Limited | Financial services | 2019 |
| Norton Advisory Group Ltd | Information & communication | 2025 |
| Norton Domestic Repairs Ltd | Manufacturing | 2005 |
| Norwich Cricket Centre Ltd | Arts & recreation | 2022 |
| Norwich Fencing Ltd | Administrative & support | 2016 |
| Norwich Operations Limited | Health & social care | 2015 |
| Norwich Road Housing (Dereham) Limited | Households | 1994 |
| Norwich Robotic Operations Limited | Health & social care | 2023 |
| Norwich Street Management Co Ltd | Real estate | 2008 |
| Norwich Traffic Control Limited | Professional & scientific | 2013 |
| Notion Innovation Ltd. | Construction | 2013 |
| Notobl Ltd | Professional & scientific | 2023 |
| Novara People Ltd | Administrative & support | 2024 |
| NR Foundation CIC | Arts & recreation | 2025 |
| NR Health & Fitness Club (Attleborough) Limited | Arts & recreation | 2021 |
| NR Health & Fitness Club (Dereham) Ltd | Arts & recreation | 2019 |
| NR Health & Fitness Club (Holdings) Limited | Financial services | 2020 |
| NR Health & Fitness Club (Lowestoft) Limited | Arts & recreation | 2022 |
| NR Health & Fitness Club (Old Hall) Limited | Arts & recreation | 2025 |
| NR Health & Fitness Club (Thetford) Limited | Arts & recreation | 2024 |
| NR Health & Fitness Club (Watton) Limited | Arts & recreation | 2020 |
| NR Health & Fitness Club (Yarmouth) Limited | Arts & recreation | 2022 |
| NR Health & Fitness Club Limited | Arts & recreation | 2017 |
| NR19 Cottage Ltd | Hospitality | 2020 |
| NR20 Developments Limited | Real estate | 2015 |
| NRS Care Limited | Administrative & support | 2017 |
| Nuraiz Food Limited | Hospitality | 2017 |
| Nurec Healthcare Limited | Administrative & support | 2024 |
| Nvlp Ltd | Information & communication | 2020 |
| OAH Construction Ltd | Construction | 2018 |
| Oak Farm Cottages Limited | Hospitality | 2022 |
| Oak Farm Equestrian Limited | Other services | 2023 |
| Oak Tree Meadow Management Company Limited | Households | 2022 |
| Oakbrock Ltd | Financial services | 2026 |
| Oboticariotluk Ltd | Wholesale & retail | 2026 |
| Odon Ltd | Administrative & support | 2020 |
| Okehelm Limited | Agriculture & fishing | 1989 |
| OKI U.K. Limited | Professional & scientific | 2023 |
| Old Buckenham Aero Club Limited | Education | 2006 |
| Old Mill Court (Wymondham) Management Company Limited | Households | 2022 |
| Oldfield Clothing Ltd | Wholesale & retail | 2016 |
| ON Point Personnel Ltd | Administrative & support | 2023 |