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

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

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