Former Owner
- Joseph L. Lilly2
- Joseph Pope1
- Joseph ben Aryeh1
- Joseph-Félix Allard1
- José Fernando Ramírez2
- Juan Antonio de la Reguera1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juana I of Castile1
- Judah ben Moses, ha-Rofe, ha-Kohen1
- Judith Lady Montefiore College6
- Julian Burgueño1
- Julius de Cardelinis1
- Jérôme Bignon1
- Kaikhusroo Minocher Jamaspasa2
- Kartause Erfurt1
- Karva, Lakṣmaṇabhaṭṭa2
- Katherine Somerset Wyttenbach Fenwick6
- Kenneth X. Robbins1
- Khouri, Elias Alexander1