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