| N3 Consumer Publications | London |
| National Association of Public Golf Courses (Amateur) (NAPGC) | Redditch |
| National Association of Swimming Clubs for the Handicapped (NASCH) | Fareham |
| National Australia Bank Ltd | London |
| National Campaign for the Arts (NCA) | London |
| National Council for School Sport (NCSS) | Loughborough |
| National Council for Voluntary Organisations (NCVO) | London |
| National Express | London |
| National Express Coaches | Birmingham |
| National Federation of Sea Anglers (NFSA) | Buckfastleigh |
|
National Galleries of Scotland | Edinburgh |
| National Grid | Warwick |
| National Ice Skating Association of UK Ltd (NISA) | Hockley |
| National Lottery Commission | London |
| The National Magazine Company Ltd | London |
| The National Magazine Company Ltd | London |
| The National Outdoor Events Association (NOEA) | Bideford |
|
National Portrait Gallery (NPG) | London |
| National Rifle Association | Woking |
| National Roller Hockey Association of England Ltd (NRHA) | Letchworth Garden City |
| National Rounders Association (NRA) | Sheffield |
| National Savings & Investments | London |
| National School Sailing Association (NSSA) | Huntingdon |
| National Small-Bore Rifle Association (NSRA) | Woking |
| National Tennis Centre | London |
|
The National Trust | Swindon |
| Nationwide Building Society | Swindon |
| Natural England | Sheffield |
|
The Natural History Museum | London |
| The Natural Power Consultants Ltd | Castle Douglas |
| NatWest Group | London |
|
NCT (The National Childbirth Trust) | London |
| NEC (UK) Ltd | London |
| Nestlé UK Ltd | York |
| Nestlé Waters UK | Rickmansworth |
| Netball Scotland | Glasgow |
| Network Rail Infrastructure Ltd | London |
| New Balance Athletic Shoes (UK) Ltd | Warrington |
| New Directions | Cardiff |
| Newcastle Building Society | Newcastle upon Tyne |
| News International Ltd | London |
| News of the World | London |
| Newsquest (Herald & Times) Ltd | Glasgow |
| Next PLC | Leicester |
| NFU Mutual Ltd | Stratford upon Avon |
| Nike (UK) Ltd | Sunderland |
| Nikon UK Ltd | Kingston upon Thames |
| Nintendo UK | Windsor |
| Nissan Motor (GB) Ltd | Rickmansworth |
| Nokia UK Ltd | Huntingdon |
| Nomura International plc | London |
| Northern & Shell Plc | London |
| Northern Foods plc | Leeds |
| Northern Ireland Archery Society (NIAS) | Craigavon |
| Northern Ireland Athletic Federation (NIAF) | Belfast |
| Northern Ireland Karate-Do Wado-Kai (NIKW) | Belfast |
| Northern Rail | Leeds |
| Northern Rock plc | Newcastle upon Tyne |
| Northern Vision | Liverpool |
| Northumbrian Water Group Ltd | Durham |
| Norton Rose | London |
| Norwich & Peterborough Building Society | Peterborough |
| Norwich Union an AVIVA Company | Norwich |
| The Number UK Ltd | London |
| NyX (Danish Forum for Art & Business) | Tranbjerg |
