- Arte della lana (Guild : Florence, Italy)1
- Arthurian romances1
- Artillery1
- Ashburnham, Bertram Ashburnham, Earl of, 1797-18781
- Assumption of the Blessed Virgin Mary1
- Assyrian Church of the East1
- Astrolabes1
- Astrology and death1
- Astronomy, Arab1
- Astronomy--Popular works1
- Aubertus, de Galardone1
- Austria1
- Badʼ al-amālī (Ūshī, ʻAlī ibn ʻUthmān)1
- Barbarossa, -15461
- Barrois, Joseph, approximately 1785-18551
- Barsauma, -4581
- Bartholomeo, de Soncino1
- Bartholomew, of San Concordio, 1262-13471
- Basilica di San Marco (Venice, Italy)1
- Bassianus, of Glisate1