Publishers
- William and Robert Chambers 4
- William Andrews & Co. 2
- William Bailey 1
- William Blackwood 1
- William Blackwood and Sons 5
- William Brendon And Son 1
- William Briggs 1
- William Brown 1
- William Clowes & Sons Ltd. 5
- William Collins 9
- William Collins Sons & Co. Ltd. 5
- William Darton And Son 1
- William Edwin Rudge 1
- William Graham 1
- William Heinemann 41
- William Heinemann Ltd. 36
- William Hunter 1
- William J. Hay 1
- William Jackson (Books) Ltd. 1
- William Kidd & Sons Ltd. 1
- William Kimber 15
- William Kimber & Co. Limited 2
- William Kimberley Limited 1
- William Lewis 6
- William Lewis(Printers)Ltd. 2
- William Macintosh 2
- William Mackenzie 2
- William Morrow 2
- William Morrow & Company 1
- William Morrow & Company Inc 2
- William P. Nimmo 1
- William Pamplin 1
- William Pickering 4
- William Pollard 1
- William Pollard & Co. Limited 1
- William R. Jenkins Company 1
- William Rees 1
- William Reeves 1
- William Satchell & Co. 1
- William Tegg 1
- Willis And Sotheran 1
- Willow Books 1
- Willow Bookscreek Press 1
- Willowkill Press 1
- Wills & Hepworth Ltd. 61
- Wilton 65 1
- Wiltshire Archaeological and Natural History Society 1
- Winchester Press 2
- Windgather Press Ltd. 4
- Windrow & Greene 3
- Windsor Publications Inc. 1
- Windward 2
- Wingham Press 2
- Wisdom Tree 1
- Witness Books 1
- Wm. Byles 1
- Wm. Collins Sons & Co. Ltd. 7
- Wm. Dawson & Sons Ltd. 1
- Wm. May & Co. Ltd. 1
- Wolf Creek Books Inc 1
- Wolfhound Press 1
- Wonder Books 1
- Wonderdog Publications 1
- Woolhope Naturalists' Field Club 1
- Worcestershire Archaeological Society 1
- World Distributors (manchester) Ltd 1
- World Distributors Ltd. 7
- World Health Organization 1
- World International 2
- World International Publisher 2
- World International Publishing Limited. 1
- World Scientific 3
- World Ship Society 4
- World War II Wreckology Group 1
- World's Work 4
- World's Work Ltd. 16
- Worpsweder Verlag 1
- Wrens Park Publishing 4
- Wright's Coal Tar Soap 1
- Wrightway Publishing Limited 1
- Wroughton History Group 5
- Wydawnictwo Morskie 1
- Wye Angling Publications 1
- Wygesty Publishing 1
- Wykeham Publications 1
- Xpress Publising 4
- Y. Lolfa 1
- Y. Lolfa Cyf. 1
- Yale Centre For British Art 1
- Yale University Press 40
- Yarrow And Company 1
- Yeoman Publishing 1
- Yerba Seca Publications 1
- York Archaeological Trust 1
- Yorkshire Archaeological Society 1
- Yorkshire Naturalists' union 2
- Young World Productions 5
- Youth Book Club Ltd. 1
- Ysgol Gyfun Aberaeron 1
- Ystalyfera 1