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

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

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