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- John Morgan (admiral), United States Navy Vice Admiral
- John Morgan (etiquette expert) (1959–2000), British expert on etiquette
- John Morgan (journalist) (1929–1988), Welsh journalist and broadcaster
- John Morgan (mathematician), mathematician at Stony Brook University
- John Morgan (physician) (1735–1789), founder of the first medical school in Colonial America
- John C. Morgan (1914–1991), United States Army Air Forces pilot and Medal of Honor recipient
- J. R. Morgan (born 1950), classicist and author, Swansea University
- J. H. Morgan (1876–1955), British brigadier-general and lawyer
- John Henry Morgan, American philosopher and President of the Graduate Theological Foundation
- John Hunt Morgan (1825–1864), Confederate Brigadier General during the American Civil War
- J. P. Morgan (1837–1913), American banker
- J. P. Morgan, Jr. (1867–1943), American banker
- SS John Morgan, a World War II liberty ship
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