William Riddell (1807–1847) was a Roman Catholic bishop.
William Riddell may also refer to:
- James Riddell (skier) (born William James Riddell; 1909–2000), British skier and author
- W. G. Riddell (1865–1957), New Zealand magistrate
- W. J. B. Riddell (1899–1976), Scottish ophthalmologist
- William Renwick Riddell (1852–1945), Canadian lawyer, judge, and historian
See also
- William Riedell (1904–1952), American naval officer, engineer, and sports shooter
- William Biddell (1825–1900), British politician
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