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

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

Theory, Set theory, Stable theory, Superstring theory, Critical theory, Theory of computation, Theory (mathematical logic), Grounded theory, Theory X and Theory Y, M-theory, Computability theory, Theory-theory, Number theory, Type theory, String theory, Scientific theory, Game theory, Decision theory, Model theory, Theory of everything, Twistor theory, Information theory, Systems theory, Naive set theory, Götaland theory, Gauge theory, Probability theory, Intuitionistic type theory, Economic Theory, Group theory, Negotiation theory, Germ theory denialism, Organizational theory, Unified field theory, Dynamical systems theory, Queer theory, Communication theory, International relations theory, Descriptivist theory of names, Fringe theory, Theory of relativity, Circumscription theory, Nordström's theory of gravitation, Molecular orbital theory, Practice theory, Morse–Kelley set theory, Theory of mind, Drive theory, Complexity theory and organizations, Cannon–Bard theory, Social theory, Lie theory, Theory (clothing retailer), Cell theory, C-K theory, Scalar–tensor theory, Interpolation theory, Evolution as fact and theory, Emission theory (relativity), Coding theory, Combinatorial game theory, Strain theory (sociology), Caloric theory, F-theory, Labeling theory, Outline of critical theory, Psychoanalytic theory, BCS theory, Vapnik–Chervonenkis theory, Conspiracy theory, Inter-universal Teichmüller theory, Quare theory, Seiberg–Witten theory, Equity theory, Continuity theory, Quantum field theory, Literary theory, Causal theory of reference, Theory of Colours, Statistical theory, Labor theory of value, Lawvere theory, Sociological theory, Type II string theory, Valence bond theory, Germ theory of disease, Theory of art, Path–goal theory, Twisted K-theory, Pattern theory, Temporal theory (hearing), Zermelo set theory, Regality theory, Introduction to M-theory, Contract theory, Actor–network theory, Heterotic string theory, Dual-coding theory, Theory of a Deadman, Bisexual theory, Matrix string theory, Graph theory, Two-factor theory, Chern–Simons theory, Yang–Mills theory, Miasma theory, Transformational theory, Development theory, Subjective theory of value, Transition state theory, Control theory, Postdevelopment theory, Set theory (music), A Theory of Justice, Perturbation theory, Singularity theory, K-theory, Representation theory, Potential theory, KK-theory, Liouville field theory, Theories of humor, Constructive set theory, Journal of Combinatorial Theory, Dependency theory, Automata theory, Bow-wow theory, Ring theory, Theory of forms, Instructional theory, Algorithmic learning theory, Power transition theory, Optimality theory, ∞-Chern–Weil theory, Polysystem theory, Grand Unified Theory, Free-radical theory of aging, Ginzburg–Landau theory, Theory of change, Brans–Dicke theory, Kaluza–Klein theory, Film theory, Kripke–Platek set theory, Theory-ladenness, Theory of planned behavior, Journal of Approximation Theory, IEEE Transactions on Information Theory, A¹ homotopy theory, Emission theory (vision), Pecking order theory, Structuration theory