| Newman Associates (Norwich) Limited | Professional & scientific | 2003 |
| Newport Caravan Park (Norfolk) Limited | Hospitality | 1963 |
| News Delivery Ltd | Wholesale & retail | 2007 |
| Newton Flotman Service Station | | 1995 |
| Next Level Management Limited | Professional & scientific | 2005 |
| NGF Play Ltd | Wholesale & retail | 2012 |
| Nicholas Warns Architect Limited | Professional & scientific | 2003 |
| Nick Holmes Scenic Artist Scenic Painter Ltd | Arts & recreation | 2014 |
| Nimmo Buildings Limited | Construction | 2007 |
| Nimmo Industrial Buildings Limited | Construction | 2002 |
| Noodle Invest Ltd | Information & communication | 2025 |
| Norfolk & Suffolk Junior Motor Cycle Club Limited | Arts & recreation | 1982 |
| Norfolk and Waveney Mind | Health & social care | 2006 |
| Norfolk Broads Direct Agency Limited | Transport & logistics | 2007 |
| Norfolk Broads Holidays Direct Limited | Administrative & support | 1997 |
| Norfolk Camping CIC | Hospitality | 2019 |
| Norfolk Child Psychiatry Ltd | Health & social care | 2023 |
| Norfolk Cottage Agency Ltd | Hospitality | 2024 |
| Norfolk County Bowling Green Company(The) Limited | Arts & recreation | 1921 |
| Norfolk EGG Limited | Agriculture & fishing | 2007 |
| Norfolk Family History Society | Education | 1996 |
| Norfolk Kebab Ltd | Hospitality | 2023 |
| Norfolk Ophthalmics Ltd | Health & social care | 2007 |
| Norfolk Polo Club Limited | Extraterritorial | 2007 |
| Norfolk Taxi Network Limited | Information & communication | 2002 |
| Norfolk Whisky Co. Limited | Manufacturing | 2005 |
| Norse Norwich Infrastructure Ltd | Construction | 2001 |
| North Dene Residents Association Limited | Administrative & support | 1975 |
| North Denes Garage Limited | Wholesale & retail | 2003 |
| North Norfolk Fish Company Limited | Wholesale & retail | 1997 |
| North Norfolk Properties Limited | Real estate | 2005 |
| North Norfolk Railway Public Limited Company | Transport & logistics | 1963 |
| North Norfolk's Garden Machinery Centre & Holt Mobility Centre Limited | Wholesale & retail | 2007 |
| North Walsham Community Centre Limited | Hospitality | 1989 |
| North Walsham Engineering Co. Limited | Wholesale & retail | 1976 |
| Northbrim Limited | | 1988 |
| Northgate Solar Controls Limited | Construction | 2016 |
| Norwich Accommodation Agency Limited | Real estate | 2005 |
| Norwich Arts Centre Limited | Arts & recreation | 1977 |
| Norwich City Community Sports Foundation | Arts & recreation | 2000 |
| Norwich City Football Club PLC | Arts & recreation | 1919 |
| Norwich Glass Company Limited | Construction | 2006 |
| Norwich Lock & Safe Limited | Manufacturing | 2003 |
| Norwich Old Spot Properties Ltd | Households | 2024 |
| Norwich School | Education | 1994 |
| Norwich School Enterprises Limited | Education | 1998 |
| Norwich Sunblinds Limited | Manufacturing | 1992 |
| NOT Just Print Limited | Professional & scientific | 1992 |
| Novum Facilities Management Limited | Administrative & support | 2006 |
| Novum Structures UK Limited | Construction | 2007 |
| NR11 Groundworks & Civil Engineering Ltd | Construction | 2004 |
| Number One Motor Co Ltd | Wholesale & retail | 2006 |
| Nzrc UK Limited | Arts & recreation | 2023 |
| Oak Grove Community Church | Other services | 2003 |
| Oak Leigh Property Management Limited | Real estate | 2007 |
| Octbox Ltd | Wholesale & retail | 2003 |
| Office Wise Limited | Administrative & support | 1997 |
| Officers Village Management Company Limited | Real estate | 2003 |
| OHA ALI Osman Ltd | Hospitality | 2026 |
| Old Lifeboat Caravan Park Limited | Hospitality | 1998 |
| Old School Management Co (Hunstanton) Limited | Households | 2002 |
| Omsaisubs Limited | Wholesale & retail | 2012 |
| Once Upon a Time Nursery School Ltd | Health & social care | 2007 |
| One the Driftway Limited | Hospitality | 2023 |
| Orchard Caravans (Norfolk) Limited | Wholesale & retail | 1995 |
| Ordec Ltd | Construction | 2024 |
| Ordtek Ltd | Construction | 2012 |
| Oris Solutions Limited | Other services | 2023 |
| Orman (Carrolls Farm) Limited | Agriculture & fishing | 1958 |
| Ortona (Nominees) Limited | Financial services | 1992 |
| Ortona Limited | Real estate | 1988 |
| Ottoway LLP | | 2004 |
| OUR MAN in Norfolk Limited | Administrative & support | 2007 |
| Ouse Valley Construction Limited | Construction | 2006 |
| Ovamill Group Limited | Other services | 2021 |
| Overstrand Garden Centre Limited | | 1984 |
| P & a Plant Supplies Limited | Wholesale & retail | 1961 |
| P M R Haulage Limited | Wholesale & retail | 2002 |
| P Woodrow Ltd | Construction | 2002 |
| P. a. Gotts Limited | Wholesale & retail | 2003 |
| P.E. Taylor Carpentry Limited | Construction | 2003 |
| P.F. & S.T. Brown Properties Limited | Construction | 1991 |
| P.F.K. Ling Limited | Wholesale & retail | 1961 |
| P.L.A. Project Management Limited | Arts & recreation | 1989 |
| P.M. Buckley Limited | Construction | 2002 |
| P55 Limited | Manufacturing | 1997 |
| Pagepost Limited | Agriculture & fishing | 1997 |
| Panam Chalu Limited | Other services | 2019 |
| Panema Trailer Engineering Limited | Manufacturing | 1976 |
| Pantaloon Limited | Wholesale & retail | 2003 |
| Papa's Nest Limited | Hospitality | 1984 |
| Parkside Denture Studio Limited | Health & social care | 2006 |
| Paul Macrow Fencing Limited | Construction | 2006 |
| Paul Saunders Installations Limited | Construction | 2025 |
| Paul Walters Plumbing and Heating Limited | Construction | 2004 |
| Paul's Cycles Limited | Wholesale & retail | 1999 |
| PC Bathrooms & Kitchens Limited | Construction | 2005 |
| Peasemarch Associates Limited | Professional & scientific | 2010 |
| Pegg Scaffolding Limited | Construction | 1999 |
| Peirson Services Limited | Health & social care | 2002 |