- A Greek-English Lexicon
- Abductive reasoning
- Abhidharma
- Alan Turing
- Albertus Magnus
- Alethic modality
- Alfred North Whitehead
- Alfred Tarski
- Analytic–synthetic distinction
- Ancient Greek
- Ancient history
- Angelika Kratzer
- Annals of Mathematics
- Antinomy
- Anviksiki
- Arend Heyting
- Argument
- Argument
- Argumentation
- Argumentation theory
- Argumentation theory
- Aristotelian logic
- Aristotle
- Arithmetic
- Arthur Prior
- Artificial intelligence
- Ash'ari
- Atomic propositions
- Augustinianism
- Augustus De Morgan
- Automated theorem proving
- Averroes
- Avicenna
- Avicennian logic
- Axiology
- Axiom
- Axiom of Choice
- Barbara Partee
- Barber paradox
- Barry Smith (ontologist)
- Begriffschrift
- Begriffsschrift
- Bertrand Russell
- Biconditional
- Binding (linguistics)
- Boethius
- Boolean logic
- Buddhist logico-epistemology
- C. I. Lewis
- Cambridge University Press
- Cantor's theorem
- Category theory
- Catuṣkoṭi
- Centre de Recherches Mathématiques
- Cf.
- Charles Babbage
- Christian humanism
- Church–Turing thesis
- Classical logic
- Cognitive science
- Completeness (logic)
- Complexity class
- Compositionality
- Computability theory
- Computational linguistics
- Computational logic
- Computer science
- Conceptions of logic
- Confucius
- Conjunction (logic)
- Conjunction introduction
- Consistency
- Constructive logic
- Constructivism (philosophy of mathematics)
- Continuum hypothesis
- Contradiction
- Cosmology (philosophy)
- Critical thinking
- Critical thinking
- David Hilbert
- Decidability (logic)
- Deductive closure
- Deductive reasoning
- Definition
- Denotation
- Deontic logic
- Description
- Dialectical
- Dialectical logic
- Dialetheism
- Digital electronics
- Digital electronics
- Digital logic
- Dirk van Dalen
- Doi (identifier)
- Douglas Hofstadter
- Dov Gabbay
- Dynamic logic (modal logic)
- Early Islamic philosophy
- Edward N. Zalta
- Elliott Mendelson
- Encyclopedia of Mathematics
- Encyclopædia Britannica
- Entailment
- Entailment (linguistics)
- Entscheidungsproblem
- Epistemic logic
- Erasmus Montanus
- European Mathematical Society
- Expression (mathematics)
- Expressive power
- Fakhr al-Din al-Razi
- Fallacies
- Fallacies
- First order logic
- First-order logic
- Formal epistemology
- Formal ethics
- Formal language
- Formal logic
- Formal proof
- Formal semantics (natural language)
- Formal system
- Formulae-as-types correspondence
- Foundations of mathematics
- Friedrich Nietzsche
- Fuzzy logics
- Garrett Birkhoff
- Gautama Buddha
- General relativity
- Georg Cantor
- Georg Wilhelm Friedrich Hegel
- George Boole
- Gerhard Gentzen
- Gongsun Long
- Gottfried Wilhelm Leibniz
- Gottlob Frege
- Graham Priest
- Graph theory
- György Lukács
- Gödel
- Gödel's incompleteness theorem
- Gödel–Dummett logic
- Han Feizi
- Harry R. Lewis
- Harvard University Press
- Henry Liddell
- Herbert Enderton
- High Middle Ages
- Hilary Putnam
- Hilbert's program
- History of logic
- Human, All Too Human
- Hypothetical syllogism
- ISBN (identifier)
- ISSN (identifier)
- Immanuel Kant
- Inconsistency
- Index of logic articles
- Index of sociopolitical thinkers
- Indiana Philosophy Ontology Project
- Inductive reasoning
- Inference
- Inference rule
- Infinitary logic
- Informal logic
- Inquisitive semantics
- Internet Encyclopedia of Philosophy
- Intuitionistic logic
- Irene Heim
- Is Logic Empirical?
- Isma'ilism
- JSTOR (identifier)
- Jaakko Hintikka
- Jan Łukasiewicz
- John Benjamins Publishing Company
- John Stuart Mill
- John von Neumann
- Jon Barwise
- Józef Maria Bocheński
- Jürgen Habermas
- Kluwer Academic/Plenum Publishers
- Kripke semantics
- Kurt Gödel
- L.E.J. Brouwer
- L.T.F. Gamut
- Lambda calculus
- Large cardinal
- Law of non-contradiction
- Law of the excluded middle
- Lewis Carroll
- LibriVox
- Linguistic modality
- Linguistics
- List of Boolean algebra topics
- List of aestheticians
- List of epistemologists
- List of ethicists
- List of fallacies
- List of fallacies
- List of logic journals
- List of logic journals
- List of logic symbols
- List of logic symbols
- List of logicians
- List of logicians
- List of mathematical logic topics
- List of mathematics articles
- List of mathematics articles
- List of metaphysicians
- List of paradoxes
- List of philosophy topics
- List of philosophy topics
- List of rules of inference
- List of set theory topics
- Logic (disambiguation)
- Logic gate
- Logic in China
- Logic in Islamic philosophy
- Logic in computer science
- Logic programming
- Logic puzzle
- Logic puzzle
- Logical conjunction
- Logical connectives
- Logical consequence
- Logical form
- Logical necessity
- Logical reasoning
- Logical reasoning
- Logical truth
- Logician
- Logician
- Logician (horse)
- Logicism
- Logos
- Logos
- Ludvig Holberg
- Many-sorted logic
- Map (mathematics)
- Martin Davis (mathematician)
- Material conditional
- Material inference
- Mathematical logic
- Mathematics
- Mathematics
- Meaning (philosophy)
- Mechanics
- Medhātithi
- Metalogic
- Metalogic
- Metamathematics
- Michael Dummett
- Mill's Methods
- Modal logic
- Model theory
- Mohists
- Muhammad Iqbal
- Multi-valued logics
- Name
- Natural deduction
- Natural language
- Necessity and sufficiency
- Negation
- Nicholas Rescher
- Non-classical logic
- Nuel Belnap
- OCLC (identifier)
- On Truth and Lies in a Nonmoral Sense
- Online Etymology Dictionary
- Organon
- Outline of logic
- Outline of logic
- Outline of mathematics
- Outline of mathematics
- Outline of philosophy
- Oxford University Press
- P.D. Magnus
- Paraconsistent logic
- Paradox
- Perseus Project
- Peter Suber
- Petr Hájek
- PhilPapers
- Philosophical logic
- Philosophy
- Philosophy and Phenomenological Research
- Philosophy of logic
- Plato
- Predicable
- Predicate logic
- Premise
- Prentice Hall
- Presupposition
- Principia Mathematica
- Principle of bivalence
- Principle of distributivity
- Principle of explosion
- Principles of Mathematical Logic
- Prior Analytics
- Probability
- Problem of multiple generality
- Programming language
- Prolog
- Proof system
- Proof theory
- Proposition
- Propositional calculus
- Propositional logic
- Qin dynasty
- Quantification (logic)
- Quantifier (logic)
- Quantum logic
- Rationality
- Real number
- Realism versus anti-realism
- Reason
- Reason
- Reasoning
- Recursion
- Recursion theory
- Reference
- Relevance logic
- Richard Montague
- Robert Brandom
- Robert Scott (philologist)
- Routledge
- Russell's paradox
- Saul Kripke
- Scientific method
- Scope (formal semantics)
- Second-order logic
- Semantics of logic
- Sequent calculus
- Set theory
- Sextus Empiricus
- Soundness
- Square of opposition
- Stanford Encyclopedia of Philosophy
- Stanislaw Schayer
- Statement (logic)
- Stephen Cole Kleene
- Stephen Hetherington
- Stoic logic
- Substitution (logic)
- Sum of Logic
- Summa Logicae
- Susan Haack
- Syllogism
- Syntax (logic)
- Taoist philosophy
- Tautology (logic)
- Temporal logic
- Term logic
- Terminology
- Ternary logic
- Tetralemma
- The Gay Science
- The Laws of Thought
- The Reconstruction of Religious Thought in Islam
- Theory of computation
- Truth
- Truth
- Truth value
- Turing degree
- University of Hawaii Press
- Validity (logic)
- Vector logic
- Vector logic
- W. V. Quine
- Wayback Machine
- Well formed formula
- Wilfred Hodges
- Wilfred Sellars
- Wilhelm Ackermann
- William Kneale (logician)
- William of Ockham
- Yogacara