William Sullivan
William Sullivan may refer to:
- William Sullivan (field hockey) (1910–?), Indian field hockey player
- Sir William Sullivan (New Zealand) (1891–1967), New Zealand politician
- William C. Sullivan (1912–1977), United States security official
- William H. Sullivan (born 1922), United States diplomat
- William J. Sullivan, American judge on the Connecticut Supreme Court
- William John Sullivan (born 1976), software freedom activist, hacker and writer
- William Laurence Sullivan (1872–1935), Unitarian clergyman and author
- William V. Sullivan (1857–1918), United States senator from Mississippi
- William Wilfred Sullivan (1839–1920), premier of Prince Edward Island
- Bill Sullivan (outfielder) (1853–1884), Irish baseball player
- Bill Sullivan (pitcher) (1868–1905), baseball player
- Billy Sullivan (American football) (1915–1998), owner of an original franchise, the Boston Patriots, of the American Football League
- Billy Sullivan (baseball) (1875–1965), major league catcher
- Billy Sullivan, Jr. (1910–1994), his son, baseball catcher
- Billy L. Sullivan (born 1980), American actor
See also