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, Probability theory, Social cognitive theory, Decision theory, Euler–Bernoulli beam theory, Set theory, Colour 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, Control theory, Theory of Good Human Nature, Penny (The Big Bang Theory), Critical race theory, Domino theory, John Dalton, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Theory of mind, Action theory, 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, Approximation theory, Zermelo–Fraenkel set theory, Chemtrail conspiracy theory, Crystal field theory, Wheel theory, Computational complexity theory, Glottalic theory, Selectorate theory, Cultural Marxism conspiracy theory, Screw theory, Communication Theory of Secrecy Systems, Field (physics), Theory of the Earth, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, The Theory of Communicative Action, Combinatorial game theory

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, Probability theory, Social cognitive theory, Decision theory, Euler–Bernoulli beam theory, Set theory, Colour 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, Control theory, Theory of Good Human Nature, Penny (The Big Bang Theory), Critical race theory, Domino theory, John Dalton, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Theory of mind, Action theory, 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, Approximation theory, Zermelo–Fraenkel set theory, Chemtrail conspiracy theory, Crystal field theory, Wheel theory, Computational complexity theory, Glottalic theory, Selectorate theory, Cultural Marxism conspiracy theory, Screw theory, Communication Theory of Secrecy Systems, Field (physics), Theory of the Earth, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, The Theory of Communicative Action, Combinatorial game theory, Decidability theory, White genocide myth, 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, Black swan theory, Unification, Critical theory, Computability theory, Cattell–Horn–Carroll theory, Secular Shrine Theory, Theory of Evil Human Nature, Arrhenius acid-base theory, Germ theory of disease, Trait theory, Algorithmic information theory, Pizzagate conspiracy theory, Lewis acid-base theory, Steady-state model, Moon landing conspiracy theories, 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, The General Theory of Employment, Interest, and Money, Special relativity, 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