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), Canadian 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
See also
- James Dewar Bourdillon, British civil servant
- Jim Dewar (disambiguation)
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