Former Owner
- Walter Ashburner1
- Walter Sneyd7
- Wilfrid Voynich4
- William Babthorpe1
- William Betham1
- William Camac4
- William Clarke1
- William Ely1
- William Ewart Gladstone1
- William Foyle3
- William Harrison Woodward1
- William Jones1
- William Maskell1
- William Ruschenberger1
- Wolfgang Täxer1
- Yajñeśvara Bhaṭṭa1
- Yitzhak Nahum Kuzi1
- Yāsīn ibn ʻAbd al-Wahhāb al-Siṭrābī1
- Zahn, Brian1
- Zosa Szajkowski1