John Ewing may refer to:
People
- John Ewing (pastor) (1732–1802), American Presbyterian pastor and university president
- John Ewing (baseball) (1863–1895), professional baseball player
- John Ewing (Indiana politician) (1789–1858), U.S. Representative from Indiana
- John Ewing (diplomat) (1857–1923), U.S. Minister to Honduras, 1913–1918
- John Ewing (Australian politician) (1863–1933), member of the WA Legislative Assembly
- John D. Ewing (1892–1952), Louisiana journalist; editor, publisher of Shreveport Times, Monroe New-Star-World
- John H. Ewing (1918–2012), member of the New Jersey General Assembly and State Senate
- John Hoge Ewing (1796–1887), U.S. Representative from Pennsylvania.
- John Ewing (goldminer) (1844–1922), New Zealand goldminer
- John C. Ewing (1843–1918), American soldier
- John T. Ewing (1856–1926), American educator, university administrator, and college football coach
- Streamline Ewing John Ewing (1917–2002), American jazz trombonist
- John Ewing (curator) Cleveland Cinematheque director & Cleveland Museum of Art curator
Fictional characters
- J. R. Ewing, fictional character; main villain on U.S. television series Dallas
- Jock Ewing (John Ross Ewing Sr.), fictional character; father of J. R. Ewing on U.S. television series Dallas
- John Ross Ewing III, fictional character; son of J. R. Ewing on U.S. television series Dallas
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