Hopfield may refer to:A field used for cultivating hops Hopfield net, a type of neural network John Joseph Hopfield, American biologist and physicist, inventor of the Hopfield net John J. Hopfield (spectroscopist) (1891–1953), American spectroscopist, with several eponymous spectral details: Hopfield bands, one of the important molecular oxygen absorption bands Lyman–Birge–Hopfield bands, one of the important molecular nitrogen absorption bands Hopfield continuum, a band in the emission spectrum of helium