Former Owner
- Wilfrid Voynich1
- William Appleton1
- William Augustus White1
- William Bateman1
- William Bragge5
- William Caxton1
- William Gibbons Medlicott2
- William H. Robinson Ltd.1
- William Harcourt Hooper1
- William Horatio Crawford3
- William Inglis Morse1
- William King Richardson1
- William Morris2
- William S. Spaulding1
- William Taylor Scheide1
- William Tyssen-Amherst, 1st Baron Amherst of Hackney1
- Wolfgang G. Scholz1
- Wolfgang Sigismund, Graf von Gallenberg1
- de Farges d'Espeisse1
- Étienne Charles de Loménie de Brienne1