Categories - Religion, Ethics
- Abington School District v. Schempp
- Aaron
- Abraham
- Abraham Joshua Heschel
- Abū al-ʿAbbās
- Abū Bakr ibn ʿUmar
- Abū Hanīfah
- Accountants Form a New Professional Association
- Act of Settlement
- Act of Supremacy
- Act of Union Is Passed by Parliament
- Adolf von Harnack
- Adoption of the Nicene Creed
- Adrian IV
- Advertisers Adopt a Truth in Advertising Code
- Afghanistan Has Ancient Buddhist Monuments Destroyed
- African American Baptist Church Is Founded
- Ahmad ibn Hanbal
- Akhenaton
- Akiba ben Joseph
- al-Ashʿarī
- Al-Ghazālī
- Al-Hallāj
- Al-Hasan al-Basrī
- al-Tabarī
- Alan Gewirth
- Alasdair MacIntyre
- Albanian-Turkish Wars
- Albert Schweitzer
- Albigensian Crusade
- Alboin
- Albrecht Ritschl
- Alcuin
- Alexander Campbell
- Alexander III
- Alexander Neckam
- Alexander VI
- Alfonso VIII
- Alfonso X
- Alfred the Great
- Algeria and Egypt Crack Down on Islamic Militants
- Algeria Cracks Down on Islamic Militants
- Almohad Conquest and Rule of Muslim Spain
- Almoravid Empire
- Alvin Plantinga
- AME Church Is Founded
- American Indian Religious Freedom Act
- Ānanda
- Anglo-French Wars
- Anglo-Spanish War