- Accident (fallacy)
- Adam de Wodeham
- Affirming the consequent
- Albert of Saxony (philosopher)
- Albertus Magnus
- Alcuin
- Amphibology
- Anselm of Canterbury
- Antecedent (logic)
- Aristotelianism
- Augustine of Hippo
- Averroes
- Begging the question
- Boethius
- Bonaventure
- Categories (Aristotle)
- Category of being
- Charles Sanders Peirce
- Complex question
- Conditional sentence
- Consequent
- Cur Deus Homo
- Dominican Order
- Duns Scotus
- Empiricism
- Equivocation
- Fallacy of accent
- Fallacy of composition
- Fallacy of division
- Franciscan Order
- Francisco Suárez
- Ignoratio elenchi
- Islamic philosophy
- Jean Buridan
- John Scotus Eriugena
- Lambert of Auxerre
- Liar paradox
- Libri Quattuor Sententiarum
- Logic
- Logical consequence
- Material conditional
- Neo-scholasticism
- Neoplatonism
- Nominalism
- Occamism
- Peter Abelard
- Peter Lombard
- Philosophy
- Philotheus Boehner
- Pope Gregory I
- Porphyry (philosopher)
- Posterior Analytics
- Predicable
- Problem of universals
- Proposition
- Protoscholastic writing
- Questionable cause
- Roman Catholic theology
- Scholasticism
- Scotism
- Secundum quid
- Sophistical Refutations
- Summa Grammatica
- Summa Theologica
- Summa logicae (Lambert)
- Syllogism
- Terminology
- Theory of obligationes
- Theory of supposition
- Thomas Aquinas
- Thomism
- Topics (Aristotle)
- Wikisource
- William of Ockham