James Dewar (disambiguation)

James Dewar (1842–1923) was a Scottish chemist and physicist.

James Dewar may also refer to:
 * James Dewar (musician) (1942–2002), Scottish bassist and vocalist
 * James Dewar (baker) (1897–1985), American inventor of the Twinkie snack cake
 * James Dewar (judge) (1797–1830), British jurist and the Chief Justice of the Supreme Court of Bombay
 * James Dewar (cricketer), English cricketer and British Army officer
 * James Dewar (footballer), of Everton F.C. season 1892–93