- Architecture1
- Architecture, Roman1
- Archival materials2
- Archives82
- 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
- Aristotle14
- Arithmetic4
- Armada (1588)6
- Armayūnī, Yūsuf ibn ʻAbd Allāh, -15511
- Armenia2
- Armenian Church1
- Armorial bindings8
- Armorial bookplates7
- Armorial stamps1
- Arnaldus, de Villanova, -13111
- Arrigucci family2