John Emerson may refer to:

  • John Wesley Emerson (1832–1899), U.S. lawyer, Civil War military commander, judge, and the founder of the Emerson Electric Company
  • John Emerson (politician) (1859–1932), Canadian mayor
  • John Emerson (filmmaker) (1874–1956), American stage actor, playwright, producer, and director of silent films
  • John B. Emerson (born 1954), president of Capital Group Private Client Services, former Deputy Assistant to President Clinton, US ambassador to Germany
  • John Haven Emerson (1906–1997), American inventor of biomedical devices
  • John Emerson (died 1843), physician and slaveowner of Dred Scott

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