Publishers
- William P. Nimmo 1
- William Pamplin 1
- William Phillips 1
- William Pickering 5
- William Pollard 1
- William Pollard & Co. Limited 2
- William R. Jenkins Company 1
- William Rees 1
- William Reeves 1
- William Rice 1
- William Satchell & Co. 1
- William Sessions 1
- William Smith 1
- William Tegg 1
- Williams & Norgate Ltd. 1
- Williams and Norgate 1
- Williams and Norgate Ltd. 1
- Willow Bookscreek Press 1
- Wills & Hepworth Ltd. 71
- Wilo-Brain 1
- Wilson & Phillips 1
- Wilson Books 1
- Wilton 65 1
- Wiltshire Record Society 1
- Winchester Press 2
- Windrow & Greene 16
- Windward 2
- Wingham Press 1
- Wisdom Tree 1
- Withers Publishing 1
- Wm. Byles 1
- Wm. Collins Sons & Co. Ltd. 7
- Wm. H. Allen & Co. 1
- Wnd Books 1
- Wolfhound Press 1
- Wolters-Noordhoff 1
- Wonderdog Publications 1
- Woodall and Venables 1
- Woodcock Publications 2
- Woodenboat Publications 1
- Woodland Publishing 1
- Woodlands Press 1
- Woolhope Naturalists' Field Club 1
- Worcestershire Archaeological Society 1
- Wordens Of Cornwall Ltd. 1
- Wordsworth Editions Ltd. 1
- Workers' Educational Association 1
- World Distributors 1
- World Distributors (manchester) Ltd 8
- World Distributors Ltd. 23
- World Health Organization 1
- World International 2
- World International Publisher 4
- World International Publishing Limited. 2
- World Scientific 2
- World Ship Society 3
- World Working Group On Birds Of Prey And Owls 1
- World's Work 8
- World's Work Ltd. 14
- Worldlist 1
- Worley Publications 4
- Wrens Park Publishing 3
- Wright 1
- Wright's Coal Tar Soap 1
- Wrightway Publishing Limited 1
- Writersworld 1
- Wroughton History Group 5
- Wydawnictwo Bm Graniczkowska 1
- Wydawnictwo Morskie 1
- Wydawnictwo Stratus 1
- Wye Angling Publications 1
- Wykeham Publications 1
- Wysawnictwo Interpress 1
- Xpress Publising 1
- Y. Lolfa 1
- Y. Lolfa Cyf. 1
- Yale Centre For British Art 1
- Yale University Press 17
- Yearling Books 1
- Yeoman Publishing 2
- Yerba Seca Publications 1
- Yore Publications 1
- Yorkshire Archaeological Society 3
- Yorkshire Architectural & York Archaeological Society 1
- Yorkshire Dales Landscape Research Trust 1
- Young World Productions 3
- Ystalyfera 1
- Zenana Bible And Medical Mission 1
- Zeppelin Study Group 1
- Ziji Publishing 2
- Zoological Society Of London 10
- Zwemmer 1