Publishers
- 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
- Zenith Press 1
- Ziji Publishing 2
- Zoological Society Of London 9
- Zwemmer 1