William Reilly may refer to:
- William K. Reilly (born 1940), Environmental Protection Agency administrator
- William L. Reilly (1916–2009), American Jesuit and academic
- William J. Reilly (1899–1970), American economist
- William Edward Moyses Reilly (1827–1886), British Army general
- William Arthur Reilly (1903–1969), American political figure from Boston
- Bill Reilly (William Francis Reilly, 1938–2008), American publishing and media executive
- Bill Reilly (athlete) (William L. Reilly, born 1943), American steeplechase runner
- Will Reilly (born 2002), American soccer player
- William K. Reilly, pseudonym used by English writer John Creasey (1908–1973)
This disambiguation page lists articles about people with the same name.
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