William or Bill Daley may refer to:
- Bill Daley (baseball) (1868-1922), American baseball player
- Bill Daley (American football) (born 1919), American footballer
- William M. Daley (born 1948), American politician from Illinois, former White House Chief of Staff
- William R. Daley, American baseball executive
- William Daley (ceramic artist)
- Billy Silverman, born William Daley, American wrestling referee