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, Systems theory, Conspiracy 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, Phlogiston theory, Hybrid 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), James–Lange theory, Cell theory, Theory of Good Human Nature, John Dalton, Penny (The Big Bang Theory), Critical race theory, Domino theory, Control theory, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Theory of mind, Action theory, Knot theory, Classical field theory, Atomic theory, Group theory, Gateway drug theory, Realism 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, Glottalic theory, Selectorate theory, Computational complexity theory, Field (physics), Communication Theory of Secrecy Systems, Cultural Marxism conspiracy theory, Screw theory, Theory of the Earth, Big Bang, Two-nation theory, 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, Systems theory, Conspiracy 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, Phlogiston theory, Hybrid 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), James–Lange theory, Cell theory, Theory of Good Human Nature, John Dalton, Penny (The Big Bang Theory), Critical race theory, Domino theory, Control theory, Christ myth theory, Marlovian theory, DNA damage theory of ageing, Theory of mind, Action theory, Knot theory, Classical field theory, Atomic theory, Group theory, Gateway drug theory, Realism 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, Glottalic theory, Selectorate theory, Computational complexity theory, Field (physics), Communication Theory of Secrecy Systems, Cultural Marxism conspiracy theory, Screw theory, Theory of the Earth, Big Bang, Two-nation theory, Brønsted–Lowry acid–base theory, The Theory of Communicative Action, Combinatorial game theory, 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), Economy-of-effort theory, Theory Dasbien, Uses and gratifications theory, Third International Theory, Unification, Black swan theory, Computability theory, Critical theory, Cattell–Horn–Carroll theory, Arrhenius acid-base theory, Secular Shrine Theory, Theory of Evil Human Nature, Germ theory of disease, Trait theory, Algorithmic information theory, Pizzagate conspiracy theory, Steady-state model, Lewis acid-base theory, Moon landing conspiracy theories, Coding theory, Theory of forms, Old quantum theory, Judeo-Masonic conspiracy theory, R/K selection theory, Theory of a Deadman, The Assault on Truth: Freud's Suppression of the Seduction Theory, Ideal (ring theory), Information entropy, Elliott wave theory, Social comparison theory, Gesell's Maturational Theory, The Genetical Theory of Natural Selection, Order theory, The Big Bang Theory season 1, VSEPR theory, The General Theory of Employment, Interest, and Money, Special relativity, General relativity, Lagrange's theorem (group theory), 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