- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʾid fī sharḥ Tajrīd al-qawāʻid1
- Iẓhār al-asrār (Birgivî Mehmet Efendi)1
- Jerome, Saint, -419 or 4201
- Jesus Christ1
- Jews1
- Jinn1
- Judaism1
- Judas Iscariot1
- Judgment Day (Islam)1
- Jugurthine War (111-105 B.C.)1
- Khānaqāh-i Niʻmat Allāhī1
- Knowledge, Theory of1
- Land tenure (Islamic law)1
- Land tenure--Law and legislation1
- Land use--Law and legislation1
- Languages, Secret1
- Laude1
- Leicester, Robert Dudley, Earl of, 1532?-15881
- Liturgics1
- Logic, Medieval1