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

Theory of computation, Dynamical systems theory, Modern Monetary Theory, Game (game theory), Control theory, Cell theory, James–Lange 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, Action theory, Theory of mind, Knot theory, Atomic theory, Classical field theory, Realism theory, Group theory, Gateway drug theory, Class (set theory), KK theory, Automata theory, Grand unification theory, Reception theory, White genocide myth, Embodiment theory, Category theory, Approximation theory, Zermelo–Fraenkel set theory, Computational complexity theory, Crystal field theory, Chemtrail conspiracy theory, Glottalic theory, Wheel theory, Cultural Marxism conspiracy theory, Selectorate theory, Screw theory, Field (physics), Theory of the Earth, Communication Theory of Secrecy Systems, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, Combinatorial game theory, Decidability 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, Miasma theory, Conspiracy theory, Recapitulation theory, Graph theory, Theory of Colours, Probability theory, Superstring theory, Social cognitive theory, Decision theory, Colour theory, Euler–Bernoulli beam theory, Set theory, Timoshenko–Ehrenfest beam theory, Systems theory, Sociocultural theory, The Theory of Moral Sentiments, Information theory, Chaos theory, Algebraic number theory, Number theory, Quantum theory, Analytic number theory, Ramsey theory, Double genocide theory, Social choice theory, Hybrid Theory, Architectural theory, Phlogiston theory, The Theory of Everything (2014 movie), Kinetic theory, Ring theory, Naive set theory, Theory of computation, Dynamical systems theory, Modern Monetary Theory, Game (game theory), Control theory, Cell theory, James–Lange 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, Action theory, Theory of mind, Knot theory, Atomic theory, Classical field theory, Realism theory, Group theory, Gateway drug theory, Class (set theory), KK theory, Automata theory, Grand unification theory, Reception theory, White genocide myth, Embodiment theory, Category theory, Approximation theory, Zermelo–Fraenkel set theory, Computational complexity theory, Crystal field theory, Chemtrail conspiracy theory, Glottalic theory, Wheel theory, Cultural Marxism conspiracy theory, Selectorate theory, Screw theory, Field (physics), Theory of the Earth, Communication Theory of Secrecy Systems, Two-nation theory, Big Bang, Brønsted–Lowry acid–base theory, Combinatorial game theory, Decidability theory, The Theory of Communicative Action, Hybrid Theory EP, Loop (graph theory), Galois theory, History of the Big Bang theory, Smiley face murder theory, Theory Dasbien, Mutualism (economic theory), Economy-of-effort theory, Third International Theory, Uses and gratifications theory, Black swan theory, Computability theory, Critical theory, Unification, Cattell–Horn–Carroll theory, Theory of Evil Human Nature, Secular Shrine Theory, Arrhenius acid-base theory, Germ theory of disease, Trait theory, Pizzagate conspiracy theory, Algorithmic information theory, Moon landing conspiracy theories, Lewis acid-base theory, Coding 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, Judeo-Masonic conspiracy theory, The General Theory of Employment, Interest, and Money, Lagrange's theorem (group theory), General relativity, Set, Freud's psychoanalytic theories, Psychoanalysis, Clinton body count conspiracy theory, Jurisprudence, Endosymbiosis, Special relativity, Sahara pump theory, Four temperaments, Plate tectonics, Infant attachment, Graph (mathematics), Evolution, Quantum mechanics, Mars ocean theory, Archimedes' principle, Styx (band)