- Angels--History of doctrines1
- Angeri, Ambrogio1
- Animals1
- Anjou dynasty, 1268-14421
- Annals and chronicles4
- Anne (Mother of the Virgin Mary), Saint3
- Annibale, di Capua, approximately 1544-15951
- Annotations34
- Annunciation to the Blessed Virgin Mary2
- Anselm, Saint, Archbishop of Canterbury, 1033-11091
- Antella, Francesco dell'1
- Anthony, of Egypt, Saint, approximately 250-355 or 3561
- Anthony, of Padua, Saint, 1195-12315
- Anthropomorphic letters4
- Anti-Catholicism1
- Anti-clericalism1
- Antichrist3
- Anticlaudianus (Alanus, de Insulis)1
- Antiphonaries353
- Antiphonaries (Service books)40