J. J. Smith

J. J. Smith may refer to:


 * J. J. Smith (Gaelic footballer), Carlow Gaelic footballer
 * J. J. Smith (author) (born 1970), American author, nutritionist and weight management expert
 * J. J. Smith or J. J. Sm., Johannes Jacobus Smith (1867–1947), Dutch botanist
 * James J. Smith, FBI Supervisory Special agent
 * James John Smith (electrical engineer), American applied mathematician
 * J. J. Smith (linguist) (1883–1949), South African linguistics