Former Owner
- John Taylor1
- John Thomas Beer1
- John Topham1
- John Ward, 1st Earl of Dudley1
- John Wright1
- Joseph Anton Koch1
- Joseph H. Haines1
- Joseph Mayner1
- José Fernando Ramírez1
- Juan de Iriarte y Cisneros1
- Julien Peridier1
- Julius Heinrich Jeidels1
- Julius de Cardelinis1
- Jérôme Pichon1
- Jāgeśvara1
- Jān Sipār Khān ibn Rustamdilkhān1
- Kaikhusroo Minocher Jamaspasa1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Kavīndrācārya, approximately 1600-approximately 16751