William Smith may refer to:
- Will Smith (New Hampshire), former member of the New Hampshire House of Representatives.
- Will Smith (Maryland), member of the Maryland House of Delegates.
- William Smith (Virginia), 2009 candidate for the Virginia House of Delegates.
- William Smith (Ohio), 2014 candidate for an Ohio seat on the U.S. House of Representatives.
- William C. Smith, judge of the municipal court in Richland County, South Carolina.
- William D. Smith, judge of Texas District 84.
- William E. Smith, judge of the District of Rhode Island
- William F. Smith, judge of the Chestnut Ridge Village Court, New York.
- William Francis Smith, former judge of the Third Circuit and District of New Jersey
- William J. Smith, Jr., judge of the Orphans Court of Wicomico County, Maryland.
- William P. Smith, judge of Texas District 110.
- William Randy Smith, judge of the West Virginia Magistrate Courts in Berkeley County, West Virginia.
- William Robert Smith, former judge of the Western District of Texas
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