Former Owner
- Julius Bisno1
- Julius Hess1
- Julius de Cardelinis1
- Justin MacCarthy Reagh3
- Jérôme Bignon1
- Jérôme Pichon1
- Jón Þorstensson1
- Jāgeśvara1
- Jān Sipār Khān ibn Rustamdilkhān1
- K-L1
- K. B. Starkie1
- Kaikhusroo Minocher Jamaspasa2
- Kang Youwei1
- Karbalāʼī Muḥammad Ḥusayn Qāsimʹābādī1
- Karen L. Gould30
- Karl Anton, Prince of Hohenzollern1
- Karl F. Morrison2
- Karl Leopold Strauven1
- Karl Wilhelm Hiersemann8
- Kartause Erfurt1