John D. Smith is a former professor of Sanskrit at Cambridge.
John D. Smith may also refer to:
- John David Smith (1786–1849), Canadian politician
- John Derek Smith (1924–2003), British biologist
- John Donnell Smith (1829–1928), American biologist
- John Douglas Smith (born 1966), Canadian sound editor
- John Donald Smith (1919–1997), Canadian politician in the Legislative Assembly of British Columbia
- John Derby Smith (1812–1884), minister, physician, and Massachusetts state legislator
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