Theory, Set theory, Stable theory, Theory of computation, Superstring theory, Critical theory, Computability theory, Grounded theory, Theory X and Theory Y, Theory-theory, M-theory, Scientific theory, Game theory, Type theory, Theory (mathematical logic), String theory, Decision theory, Model theory, Twistor theory, Gauge theory, Probability theory, Theory of everything, Information theory, Economic Theory, Number theory, Naive set theory, Negotiation theory, Systems theory, Götaland theory, Intuitionistic type theory, Germ theory denialism, Descriptivist theory of names, Group theory, Nordström's theory of gravitation, Dynamical systems theory, Practice theory, Fringe theory, Molecular orbital theory, Cannon–Bard theory, Organizational theory, Queer theory

Communication theory, International relations theory, Unified field theory, C-K theory, Morse–Kelley set theory, Lie theory, Theory of mind, Complexity theory and organizations, Theory of relativity, Circumscription theory, Drive theory, F-theory, Inter-universal Teichmüller theory, Statistical theory, Psychoanalytic theory, Scalar–tensor theory, Interpolation theory, Labeling theory, Combinatorial game theory, Quare theory, Outline of critical theory, Lawvere theory, Emission theory (relativity), Social theory, Theory (clothing retailer), Heim theory, Caloric theory, Coding theory, Strain theory (sociology), Cell theory, BCS theory, Vapnik–Chervonenkis theory, Continuity theory, Path–goal theory, Seiberg–Witten theory, Quantum field theory, Labor theory of value, Sociological theory, Equity theory, Type II string theory, Causal theory of reference, Conspiracy theory, Literary theory, Theory of Colours, Heterotic string theory, Evolution as fact and theory, Valence bond theory, Theory of art, Twisted K-theory, Germ theory of disease

Theory, Set theory, Stable theory, Theory of computation, Superstring theory, Critical theory, Computability theory, Grounded theory, Theory X and Theory Y, Theory-theory, M-theory, Scientific theory, Game theory, Type theory, Theory (mathematical logic), String theory, Decision theory, Model theory, Twistor theory, Gauge theory, Probability theory, Theory of everything, Information theory, Economic Theory, Number theory, Naive set theory, Negotiation theory, Systems theory, Götaland theory, Intuitionistic type theory, Germ theory denialism, Descriptivist theory of names, Group theory, Nordström's theory of gravitation, Dynamical systems theory, Practice theory, Fringe theory, Molecular orbital theory, Cannon–Bard theory, Organizational theory, Queer theory, Communication theory, International relations theory, Unified field theory, C-K theory, Morse–Kelley set theory, Lie theory, Theory of mind, Complexity theory and organizations, Theory of relativity, Circumscription theory, Drive theory, F-theory, Inter-universal Teichmüller theory, Statistical theory, Psychoanalytic theory, Scalar–tensor theory, Interpolation theory, Labeling theory, Combinatorial game theory, Quare theory, Outline of critical theory, Lawvere theory, Emission theory (relativity), Social theory, Theory (clothing retailer), Heim theory, Caloric theory, Coding theory, Strain theory (sociology), Cell theory, BCS theory, Vapnik–Chervonenkis theory, Continuity theory, Path–goal theory, Seiberg–Witten theory, Quantum field theory, Labor theory of value, Sociological theory, Equity theory, Type II string theory, Causal theory of reference, Conspiracy theory, Literary theory, Theory of Colours, Heterotic string theory, Evolution as fact and theory, Valence bond theory, Theory of art, Twisted K-theory, Germ theory of disease, Set theory (music), Temporal theory (hearing), Introduction to M-theory, Yang–Mills theory, Pattern theory, Dual-coding theory, Bisexual theory, Chern–Simons theory, Zermelo set theory, Graph theory, Regality theory, Matrix string theory, Two-factor theory, Transition state theory, Bow-wow theory, Contract theory, Actor–network theory, Miasma theory, Algorithmic learning theory, Theory of a Deadman, Perturbation theory, Potential theory, Singularity theory, Grand Unified Theory, Development theory, Transformational theory, Dependency theory, Postdevelopment theory, K-theory, Representation theory, Journal of Combinatorial Theory, Ring theory, Power transition theory, Liouville field theory, Subjective theory of value, ∞-Chern–Weil theory, A Theory of Justice, Theory of forms, Optimality theory, KK-theory, Control theory, Automata theory, Identity theory, Structuration theory, Ginzburg–Landau theory, Constructive set theory, Kaluza–Klein theory, Pecking order theory, Kripke–Platek set theory, Theory of Change, Instructional theory, Polysystem theory, Journal of Approximation Theory, Einstein–Cartan theory, Free-radical theory of aging, Brans–Dicke theory, Homotopy type theory, Dempster–Shafer theory, Film theory, Plate theory