Publishers
- Willow Books 1
- Willow Bookscreek Press 1
- Wills & Hepworth Ltd. 76
- Wilo-Brain 1
- Wilton 65 1
- Wiltshire Archaeological and Natural History Society 2
- Windgather Press Ltd. 7
- Windrow & Greene 5
- Windsor Publications Inc. 1
- Windward 2
- Windy Hall Publications 1
- Wingham Press 1
- Wisdom Tree 1
- Withers Publishing 1
- Wm. Byles 1
- Wm. Collins Sons & Co. Ltd. 7
- Wm. May & Co. Ltd. 1
- Wolf Creek Books Inc 1
- Wolfhound Press 1
- Wonder Books 1
- Wonderdog Publications 1
- Woodpecker Publications 1
- Woolhope Naturalists' Field Club 1
- Worcestershire Archaeological Society 1
- Wordwell Ltd 1
- World Distributors (manchester) Ltd 3
- World Distributors Ltd. 7
- World Health Organization 1
- World International 2
- World International Publisher 3
- World International Publishing Limited. 1
- World Scientific 3
- World Ship Society 7
- World's Work 4
- World's Work Ltd. 17
- Wrens Park Publishing 4
- Wright 1
- Wright's Coal Tar Soap 1
- Wrightway Publishing Limited 1
- Wroughton History Group 5
- Wydawnictwo Morskie 1
- Wye Angling Publications 1
- Wykeham Publications 1
- Xpress Publising 6
- Y. Lolfa 1
- Y. Lolfa Cyf. 1
- Yale Centre For British Art 1
- Yale University Press 52
- Yarrow And Company 1
- Yearling Books 1
- Yeoman Publishing 1
- Yerba Seca Publications 1
- York Archaeological Trust 1
- Yorkshire Archaeological Society 1
- Yorkshire Naturalists' union 2
- Yorkshire Sculpture Park 1
- Young World Productions 4
- Youth Book Club Ltd. 1
- Ystalyfera 1
- Zenger Publishing Co. Inc. 1
- Zenith Press 1
- Ziji Publishing 2
- Zoological Society Of London 9