Former Owner
- John Willis1
- John Wright1
- Jonathan Peckover1
- Josceline Bagot1
- Joseph François René de Kergariou1
- Joseph Haslewood1
- Joseph Marie Sormani1
- Joseph May Spetzler1
- Joseph Whitney1
- Josiah H. Benton1
- Juan de Aillon1
- Juan de Torquemada1
- Jules Bonhomme1
- Julie de Busnel1
- Julius Hess1
- Julius de Cardelinis1
- K-L1
- Karl F. Morrison1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Kenneth Hyde1