Sir John Williams may refer to:
- Sir John Williams, 1st Baronet, of the City of London (1840-1926), Welsh baronet, physician and principal founder of the National Library of Wales
- Sir John Williams, Surveyor of the Navy (1700-1784), English naval architect
- General Sir John Williams KCB (1823-1911), British Royal Marines officer
- Sir John Williams, 2nd Baronet, of Eltham (1653-1723) English baronet and Member of Parliament
- Sir John Williams, 2nd Baronet, of Llangibby (1651-1704) Welsh baronet and Member of Parliament
- Sir John Williams (1675-1743) English merchant, Member of Parliament, and Lord Mayor of London
- Sir John Bickerton Williams (1792-1855) English nonconformist author and lawyer
- Sir John Hay Williams, 2nd Baronet, of Bodelwyddan (1794-1859) Welsh baronet and High Sheriff
See also
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This disambiguation page lists articles associated with the title Sir John Williams.
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