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

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

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