Author
- Jacob Meyer1
- Jacob ben Reuben ibn Zur1
- Jaghmini1
- Jai Singh II1
- Jalal al-Din Davani1
- Jalal al-Din Mohammad Tabrizi1
- Jamshīd al-Kāshī1
- Jamāl al-Dīn Khvānsārī1
- Jawād ibn Saʻd Jawād al-Baghdādī1
- Jaʻfar Astarābādī1
- Jewish Community of Amsterdam, Netherlands1
- Jewish Community of Padua, Italy1
- Jews1
- Joseph Yitzchak Hakohen Poppers1
- Juan Félix de Rújula1
- Juan Vicente de Güemes, 2nd Count of Revillagigedo1
- Juana I of Castile1
- Judah Leib Prossnitz1
- Judah Rosanes1
- Kalonymus ben Kalonymus1