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

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