Encyclopedias, Almanacs, Transcripts, and Maps
- Austregisilus (Outril), St.
- Austria, The Catholic Church in
- Ausubel, David Paul
- Ausubel, Nathan
- Authoritarianism and Democratization
- Authority, Civil
- Authority, Ecclesiastical
- Authority, Rabbinical
- Auto da Fé
- Autocephaly
- Autographs
- Autonomism
- Autonomy, Judicial
- Autopsies and Dissection
- Autos Sacramentales
- Autpert, Ambrose, St.
- Autun
- Autun, Councils of
- Auxerre
- Auxerre