Former Owner
- Walter Thomas Wallace1
- Wheldon & Wesley1
- Wilfrid Voynich1
- William Bateman1
- William Caxton1
- William Foyle1
- William Harrison Woodward1
- William J. Shaw1
- William Salloch1
- Wolfgang Sigismund, Graf von Gallenberg1
- Wolfgang Täxer1
- Yitzhak Nahum Kuzi1
- Yāsīn ibn ʻAbd al-Wahhāb al-Siṭrābī1
- Yūsuf ibn Shaykh Muḥammad Jamālī1
- Zāwiyah al-Nāṣiriyah1
- al-Ḥājj ʻAbd al-Qādir ibn al-Sayyid ʻAbd Allāh al-Asṭawānī1
- Álvar Gómez de Castro1
- Şanizade Ataullah Efendi1
- ʻAbd Allāh al-Asṭawānī1
- ʻAbd al-Fattāḥ al-Qāṭin1