Publishers
- Willow Bookscreek Press 1
- Willowkill Press 1
- Wills & Hepworth 1
- Wills & Hepworth Ltd. 125
- Wilton 65 1
- Wiltshire Archaeological and Natural History Society 1
- Winchester Press 1
- Windgather Press Ltd. 4
- Windrow & Greene 3
- Windsor Publications Inc. 1
- Windward 1
- Wingham Press 2
- Wisdom Tree 1
- Witness Books 1
- Wm. Byles 1
- Wm. Collins Sons & Co. Ltd. 7
- Wm. Dawson & Sons 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 2
- World Distributors Ltd. 9
- World Health Organization 1
- World International 2
- World International Publisher 2
- World International Publishing Limited. 2
- World Scientific 3
- World Ship Society 3
- World War II Wreckology Group 1
- World's Work 4
- World's Work Ltd. 13
- 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 51
- Yarrow And Company 1
- York Archaeological Trust 1
- Yorkshire Archaeological Society 1
- Yorkshire Naturalists' union 2
- Young World Productions 4
- Youth Book Club Ltd. 1
- Ysgol Gyfun Aberaeron 2
- Ystalyfera 1
- Zenith Press 1
- Ziji Publishing 2
- Zoological Society Of London 9
- Zoological Society Of San Diego 1
- Zwemmer 1