William Sullivan
William Sullivan may refer to:
Government
- William J. Sullivan, American judge on the Connecticut Supreme Court
- William H. Sullivan, United States diplomat
- William Sullivan (Kentucky politician), Kentucky state senator
- William C. Sullivan, former head of the Federal Bureau of Investigation's intelligence operations
- William T. Sullivan, Wisconsin state representative
- Sir Bill Sullivan (politician), New Zealand minister of labour
- William P. Sullivan, Missouri state representative
- William Wilfred Sullivan, premier of Prince Edward Island
- William V. Sullivan, United States senator from Mississippi
- William F. Sullivan, associate justice for the Massachusetts Superior Court
Sports and related
- William Sullivan (cricketer), Australian cricketer
- William Sullivan (field hockey), Indian field hockey player
- Bill Sullivan (outfielder), Irish baseball player
- Bill Sullivan (pitcher), baseball player for the Syracuse Stars
- Billy Sullivan (businessman), owner of the Boston Patriots, an original franchise of the American Football League
- Billy Sullivan (baseball, born 1875), major league catcher
- Billy Sullivan Jr., his son, baseball catcher
- William Sullivan (pitcher), baseball player for the St. Louis Maroons
- Billy Sullivan (rugby league), Australian rugby league player and coach
Others
- William John Sullivan, software freedom activist, hacker, and writer
- William Laurence Sullivan, Unitarian clergyman and author
- William L. Sullivan (author), American author
- William D. Sullivan, United States Navy officer
- William Matheus Sullivan, American lawyer and art patron
- William Holmes Sullivan, British painter
- William N. Sullivan, American entomologist
- William Kirby Sullivan, Irish philologist
- Billy Sullivan (actor), American character actor
- William "Rocky" Sullivan, character in Angels with Dirty Faces
- Bill Sullivan (artist), American painter, printmaker and publisher