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- John Douglas (architect) (1830–1911), British architect
- John Douglas (conductor) (1956–2010), American conductor
- John Douglas (lithotomist) (died 1759), surgeon
- John E. Douglas (born 1945), FBI criminal profilers
- John William Douglas (1814–1905), English entomologist
- John Douglas (Royal Marines officer) (died 1814), involved in a scandal regarding an alleged illegitimate child born to the Princess of Wales, Caroline of Brunswick
- John W. Douglas (1921–2010), American attorney and civil rights advocate
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