- Khiḍr (Legendary character)2
- Khūjahʹzādah, ʻAbd al-Naṣīr ibn ʻAbd Allāh, active 16th century. Taḥrīrāt ʻalá al-Ṭarīqah al-Muḥammadīyah1
- Knowledge, Theory of (Islam)1
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- Kumayl ibn Ziyād, 633 or 634-7011
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)2
- Lamaʻāt (ʻIrāqī, Fakhr al-Dīn Ibrāhīm)2
- Language and languages--Philosophy2
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- Manāzil al-sāʼirīn (Anṣārī al-Harawī, ʻAbd Allāh ibn Muḥammad)2