- Alphabet--Religious aspects--Islam1
- Alphabets1
- Ambrosian chants2
- Ambrosian rite (Catholic Church)1
- Andrew, Apostle, Saint1
- Angulo family1
- Angulo, Alonso de1
- Anne (Mother of the Virgin Mary), Saint2
- Anselm, Saint, Archbishop of Canterbury, 1033-11091
- Anthony, of Padua, Saint, 1195-12311
- Anti-Catholicism1
- Anticlaudianus (Alanus, de Insulis)1
- Antonio Magistri1
- Antonius, de Parma, active 1310-13231
- Apocryphal books1
- Apologetics2
- Arabic alphabet--Religious aspects--Islam1
- Arabic language5
- Arabic language--Figures of speech2
- Arabic language--Grammar7