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

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

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