- Architecture, Roman1
- Arcibucci, Alessandro1
- Ardabīlī, Aḥmad ibn Muḥammad, -1585. Majmaʻ al-fāʼidah wa-al-burhān fī sharḥ Irshād al-adhhān1
- Ardabīlī, Muḥammad ibn ʻAbd al-Ghanī, 1572-1627. Sharḥ al-Unmūdhaj1
- Ardabīlī, Yūsuf ibn Ibrāhīm, -1396 or 1397. Anwār li-aʻmāl al-abrār fī fiqh al-Imām al-Shāfiʻī1
- Argonauts (Greek mythology)1
- Armayūnī, Yūsuf ibn ʻAbd Allāh, -15511
- Armenian Church1
- Armorial stamps1
- Arnaldus, de Villanova, -13111
- Arrigucci, Andrea1
- Arrigucci, Donato1
- Asceticism1
- Assassination1
- Assyrian Church of the East1
- Astrology and death1
- Astrology, Hebrew1
- Astrology--Religious aspects1
- Astronomy, Greek1
- Astronomy--Popular works1