- Ascetics1
- Ashkenazi, Ẓevi Hirsch ben Jacob, -17181
- Asia1
- Astarābādhī, Muḥammad ibn ʻAlī, -1618 or 1619. Manhaj al-maqāl fī taḥqīq aḥwāl al-rijāl1
- Astrological geomancy1
- Astrometeorology1
- Astronomy, Ancient1
- Astronomy, Medieval1
- Astronomy--Religious aspects1
- Astronomy--Religious aspects--Islam1
- Astronomy--Religious aspects--Jainism1
- Atonement1
- Atonement (Prayer)1
- Atonement (Prayer)--Hinduism1
- Austria1
- Austria--Vienna1
- Authority--Religious aspects1
- Authors, Arab1
- Aveiro, Gabriel de Lencastre, Duque de, 1667-17451
- Avicenna, 980-10371