{{wiktionary|quantum theory}} '''Quantum theory''' may refer to:
==Science== *Quantum mechanics, a major field of physics *Old quantum theory, predating modern quantum mechanics * Quantum field theory, an area of quantum mechanics that includes: ** Quantum electrodynamics ** Quantum chromodynamics ** Electroweak interaction * Quantum gravity, a field of theoretical physics * Quantum optics * Quantum chemistry * Quantum information * ''Quantum Theory: Concepts and Methods'', a 1993 book by Asher Peres
==Arts and other media== * ''Quantum Theory'' (video game), a 2010 video game * "Quantum Theory", a song on the Jarvis Cocker album ''Jarvis''
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