Author
- John XXI1
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John Dokeianos1
- John, Duke of Berry1
- Joseph Albaradani1
- Joseph Trani1
- Joseph ben Ephraim Karo1
- Joseph ben Moses Sarfati1
- Joseph ibn Abitur1
- Joseph ibn Migash1
- Joshua Benzion Segre1
- Juan de Torquemada1
- Juana I of Castile1
- Jullien Gervais1
- Jñānamṛtapata1
- Kahvecizâde, Ahmed bin Hüseyin1
- Kalyanamalla1
- Kanada1
- Kauśikarāma1