Author
- Israel Alnaqua1
- Israel Yaakov Algazi1
- Issachar ben Mordecai ibn Susan1
- Jacob Berab1
- Jacob HaLevi of Marvège1
- Jacob Israel Karmi1
- Jacob Jacobke Heilprin1
- Jacob Meyer1
- Jacob Saphir1
- Jacob ben David ben Yom Tov1
- Jacob ben Machir ibn Tibbon1
- Jacob ben Reuben ibn Zur1
- Jacob ibn Habib1
- Jewish Community of Amsterdam, Netherlands1
- Jewish Community of Padua, Italy1
- Jewish community of unidentified city, Italy1
- Jewish prayers1
- Joachim Heinrich Campe1
- Johannes de Sacrobosco1
- Jonathan Eybeschutz1