Author
- Ishmael ben Abraham Isaac ha-Kohen1
- Jacob HaLevi of Marvège1
- Jacob ben David ben Yom Tov1
- Jacob ben Hayyim Zemah1
- Jacob ibn Habib1
- Jakob Reifmann1
- Jerome1
- Jewish Community of Amsterdam, Netherlands1
- Johannes de Sacrobosco1
- Joseph Albaradani1
- Joseph Nasi1
- Joseph Trani1
- Joseph ben Judah ibn Aknin1
- Joseph ben Moses Sarfati1
- Joseph ibn Abitur1
- Joseph ibn Migash1
- Joshua Benzion Segre1
- Judah Leib Ben Zeev1
- Judah Rosanes1
- Kimhi Yitzhak ben Mordekhai1