Publishers
- Nelson & Phillips 1
- Nelson And Saunders 1
- Nemo Productions 1
- Nestle And Anglo-Swiss Condensed Milk Co. 1
- Neville Granville 1
- New Cavendish Books 5
- New English Library 2
- New Enterprise Publications 1
- New Era Publications 1
- New Holland 2
- New Holland Publishers (uk) Ltd 1
- New York Graphic Society Publishers 1
- New York University Press 2
- Newnes 7
- Newport & Monmouthshire Historical Association 2
- Newport Corporation 2
- Newport Golf Club 2
- News Chronicle 7
- News Chronicle Ltd. 1
- News Chronicle Publications 7
- Newton 2
- Nexus Special Interests Ltd 1
- Nicholas Kaye 1
- Nichols And Sons 1
- Nicholson & Watson 5
- Nick McCann Associates Ltd 3
- Nick Waters 2
- Nickerson & Collins 1
- Nihon Keizei Shimbun 1
- Nisbet & Co. Ltd. 19
- Nister & Co. 1
- Nister & Co. Ltd. 4
- Niton Publishing 5
- Nmse Publishing 1
- NO NAME 1
- Noel Carrington 2
- Noel Douglas 1
- Norfolk & Norwich Naturalists' Society 1
- Norfolk Museums Service 1
- Norman Adlard & Co. Ltd. 1
- Norman Wright 6
- North Atlantic Books 2
- North Holland Publishing Company 1
- North South Books 1
- North-East Scotland Bird Club 1
- North-Holland Publishing Company 3
- North-South Books 4
- Northampton Development Corporation 1
- Northamptonshire County Council 1
- Northamptonshire Libraries 1
- Northern Books 1
- Northern Mine Research Society 3
- Northumberland County Library 1
- Northumberland Press 1
- Northwood Books 1
- Nostalgia Road Publications 2
- Nottingham City Museums 1
- Nottingham Civic Society 1
- Nova Publishers 2
- Nova Science Publishers 4
- Noyes, Platt & Company 1
- Nucleo Applicazioni Sperimentali Aeromodellistiche 1
- O.R. Reisland 1
- O'Reilly 1
- Oak Knoll Press 3
- Oaklands 1
- Oakmagic Publications 1
- Oakridge Historical Research Group 2
- Obv 1
- Ocean Boos Pvt. Ltd 1
- Octopus Books Ltd. 2
- Odhams Books 2
- Odhams Press 1
- Odhams Press Limited 1
- Odhams Press Ltd. 4
- Office For Official Publications Of The European Communities 1
- Office Of Air Force History 2
- Office Of The Chief Of Military History 1
- Office Of The Chief Of Military History United States Army 1
- Offices Of The Studio 1
- Oireacht Na Mumhan Books 3
- Oklahoma State Department Of Education 1
- Old Bakehouse Publications 3
- Old Comrades Association 1
- Old Hall Press 1
- Oldbourne Book Co. Ltd. 7
- Oldbourne Press 1
- Olfran Books 1
- Oliphant, Anderson & Ferrier 1
- Oliphants Ltd. 1
- Oliver & Boyd 8
- Oliver and Boyd 9
- Olivetti 1
- Omega Books 1
- Omnibus Books 1
- On Parallel Lines Publishing 1
- Oneworld 2
- Orbis 2
- Orbis Publishing 2
- Orchard Books 12