William Willett (1856–1915) was an English builder and promoter of daylight saving time.
William Willett may also refer to:
- William Willett Jr. (1869–1938), U.S. Representative
 - William Willett (Royal Navy officer) (1919–1976)
 
See also
- William Willet, American artist
 - William Willetts (disambiguation)
 
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