- Arrigucci family1
- Arrigucci, Caterina1
- Arrigucci, Luigi1
- Art1
- Art, Indic1
- Artillery1
- Asharites1
- Ashbāh wa-al-naẓāʼir (Ibn Nujaym, Zayn al-Dīn ibn Ibrāhīm)1
- Ashkenazim1
- Astrolabes6
- Astrology10
- Astrology, Arab8
- Astronomical instruments2
- Astronomy6
- Astronomy, Arab27
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah10
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah. Qism al-Ṭabīʻī wa-al-ilāhī1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, d. 1265. Hidāyat al-ḥikmah2
- Atlases1
- Atlases (Geographic)6