Scientific theory, Theory of everything, Game theory, String theory, Horseshoe Theory, Theory of relativity, M-theory, Music theory, The Big Bang Theory, Recapitulation theory, Graph theory, Theory of Colours, Superstring theory, Social cognitive theory, Probability theory, Decision theory, Euler–Bernoulli beam theory, Colour theory, Set theory, Timoshenko–Ehrenfest beam theory, Conspiracy theory, Systems theory, The Theory of Moral Sentiments, Sociocultural theory, Fishhook Theory, Information theory, Chaos theory, Algebraic number theory, Number theory, Quantum theory, Analytic number theory, Ramsey theory, Double genocide theory, Social choice theory, Architectural theory, Hybrid Theory, Phlogiston theory, The Theory of Everything (2014 movie), Kinetic theory, Ring theory, Naive set theory

Theory of computation, Dynamical systems theory, Miasma theory, Modern Monetary Theory, Game (game theory), Cell theory, James–Lange theory, Theory of Good Human Nature, Penny (The Big Bang Theory), Control theory, Critical race theory, John Dalton, Domino theory, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Action theory, Theory of mind, Knot theory, Atomic theory, Classical field theory, Group theory, Realism theory, Gateway drug theory, Class (set theory), KK theory, Automata theory, Miasma theory of disease, Grand unification theory, Reception theory, Embodiment theory, Category theory, Zermelo–Fraenkel set theory, Approximation theory, Chemtrail conspiracy theory, Crystal field theory, Computational complexity theory, Wheel theory, Glottalic theory, Selectorate theory, Cultural Marxism conspiracy theory, Field (physics), Screw theory, Communication Theory of Secrecy Systems, Theory of the Earth, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, Combinatorial game theory, The Theory of Communicative Action

Scientific theory, Theory of everything, Game theory, String theory, Horseshoe Theory, Theory of relativity, M-theory, Music theory, The Big Bang Theory, Recapitulation theory, Graph theory, Theory of Colours, Superstring theory, Social cognitive theory, Probability theory, Decision theory, Euler–Bernoulli beam theory, Colour theory, Set theory, Timoshenko–Ehrenfest beam theory, Conspiracy theory, Systems theory, The Theory of Moral Sentiments, Sociocultural theory, Fishhook Theory, Information theory, Chaos theory, Algebraic number theory, Number theory, Quantum theory, Analytic number theory, Ramsey theory, Double genocide theory, Social choice theory, Architectural theory, Hybrid Theory, Phlogiston theory, The Theory of Everything (2014 movie), Kinetic theory, Ring theory, Naive set theory, Theory of computation, Dynamical systems theory, Miasma theory, Modern Monetary Theory, Game (game theory), Cell theory, James–Lange theory, Theory of Good Human Nature, Penny (The Big Bang Theory), Control theory, Critical race theory, John Dalton, Domino theory, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Action theory, Theory of mind, Knot theory, Atomic theory, Classical field theory, Group theory, Realism theory, Gateway drug theory, Class (set theory), KK theory, Automata theory, Miasma theory of disease, Grand unification theory, Reception theory, Embodiment theory, Category theory, Zermelo–Fraenkel set theory, Approximation theory, Chemtrail conspiracy theory, Crystal field theory, Computational complexity theory, Wheel theory, Glottalic theory, Selectorate theory, Cultural Marxism conspiracy theory, Field (physics), Screw theory, Communication Theory of Secrecy Systems, Theory of the Earth, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, Combinatorial game theory, The Theory of Communicative Action, White genocide myth, Decidability theory, Galois theory, Loop (graph theory), History of the Big Bang theory, Hybrid Theory EP, Smiley face murder theory, Mutualism (economic theory), Theory Dasbien, Economy-of-effort theory, Uses and gratifications theory, Third International Theory, Unification, Black swan theory, Critical theory, Computability theory, Cattell–Horn–Carroll theory, Theory of Evil Human Nature, Secular Shrine Theory, Arrhenius acid-base theory, Germ theory of disease, Trait theory, Algorithmic information theory, Pizzagate conspiracy theory, Lewis acid-base theory, Moon landing conspiracy theories, Steady-state model, Coding theory, Judeo-Masonic conspiracy theory, Theory of forms, Old quantum theory, R/K selection theory, Theory of a Deadman, Ideal (ring theory), The Assault on Truth: Freud's Suppression of the Seduction Theory, Information entropy, Elliott wave theory, Social comparison theory, Gesell's Maturational Theory, Order theory, The Genetical Theory of Natural Selection, The Big Bang Theory season 1, VSEPR theory, Special relativity, The General Theory of Employment, Interest, and Money, Lagrange's theorem (group theory), General relativity, Set, Freud's psychoanalytic theories, Psychoanalysis, Jurisprudence, Endosymbiosis, Sahara pump theory, Four temperaments, Plate tectonics, Infant attachment, Graph (mathematics), Evolution, Quantum mechanics, Mars ocean theory