- Abelard
- Abraham
- Adam
- Adrian III
- Adrienne von Speyr
- Albert
- Alcuin
- Alexander the Great
- Alexander VI
- Alfred the Great
- Alhacen
- Ambrose
- Amyraldus
- Amyraut
- Anne Hutchinson
- Anselm
- Antiochus IV
- Apollinaris of Laodicea
- Aquinas
- Aristotle
- Arius
- Arminius
- Arndt
- Arnold of Brescia
- Athanasius
- Augustine
- Averroes
- Avicenna
- Calvin
- Campbell
- Capadocians Fathers
- Cardinal Cajetan
- Carl Henry
- Cassian
- Catherine of Aragon
- Caxton
- Cerularius
- Charlemagne
- Charles Hodge
- Charles Martel
- Charles V
- Chaucer
- Clement I
- Clement of Alexandria
- Clement of Rome
- Clement V
- Clement VII
- Clement VIII
- Clovis
- Cohen
- Constans
- Constantine
- Copernicus
- Cortes
- Count Nikolaus Ludwig von Zinzendorf
- Cranmer
- Cromwell
- Cyprian
- Cyril
- Cyril of Thessalonica
- Machen
- Machen
- Maimonides
- Malary
- Marcion
- Marcus Aurelius
- Marsilius of Padua
- Martel
- Martin Luther
- Mary
- Mary Tudor
- Maurice
- Maximus the Confessor
- Maximus the Confessor
- McIntire
- McPherson
- Medici
- Melanchthon
- Mencken
- Mendelssohn
- Menno Simons
- Methodius
- Michael du Bay
- Miller
- Miltitz
- Molina
- Montanus
- Moody
- Moses
- Muhammad
- Mullins
- Müntzer
Note: Ancient and medieval figures, as well as popes, are typically listed by first name. For ancient theologians, where exact dates of birth and death are often unknown, “c.” (Latin for circa) means “approximately” and “fl.” (for “flourished”) refers to the period at which time this person was known to be active.