- Quadrants (Astronomical instruments)1
- Qāḍīʹzādah, Mūsá ibn Muḥammad, -approximately 1436. Sharḥ Mulakhkhaṣ fī al-hayʼah1
- Qāḍīʹzādah, Mūsá ibn Muḥammad, -approximately 1436. Sharḥ al-Mulakhkhaṣ fī al-hayʼah1
- Qūshjī, ʻAlī ibn Muḥammad, -1474 or 1475. Risālah fī al-hayʼah1
- Qūshjī, ʻAlī ibn Muḥammad, d. 1474 or 5. Risālah dar hayʼat1
- Religious life--Islam1
- Rāmizah fī ʻilmay al-ʻarūḍ wa-al-qāfiyah (Khazrajī, ʻAbd Allāh ibn ʻUthmān)1
- Smoking (Islamic law)1
- Solar eclipses1
- Tadhkirah fī ʻilm al-hayʼah (Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad)1
- Tajrīd al-iʻtiqād (Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad)1
- Tenth century1
- Terminology1
- Time measurements1
- Turkah, Muḥammad ibn Ḥabīb Allāh, active 14th century. Qawāʻid al-tawḥīd1
- Turkey1
- Twelfth century1
- Umm al-barāhīn fī ʻilm al-kalām (Sanūsī, Muḥammad ibn Yūsuf)1
- Ventilation1
- Weather forecasting1