J. M. Smith may refer to:
Jabez M. Smith (?–1891), Arkansas state senator Jabez Melville Smith (1843–?), Mississippi state legislator James Marcus Smith, birth name of P. J. Proby (born 1938), American singer, songwriter, and actor J. M. Smith (Arizona politician), member of the 6th and 7th Arizona State Legislatures 1923–1926 J. M. Smith (Texas politician), member of the 3rd Texas Legislature 1849–1850