William, Will, Bill, or Billy Carroll may refer to:
Arts and entertainment William A. Carroll (1876–1928), American silent film actor Bill Carroll (broadcaster) (born 1959), Canadian radio broadcast personality Bill Carroll (musician) (born 1966), American singer, songwriter, record producer, bassist and guitarist
Law and politics William Carroll (Tennessee politician) (1788–1844), American politician, Governor of Tennessee William Carroll (Australian politician) (1872–1936), Australian Senator William F. Carroll (1877–1964), Canadian lawyer, judge, and politician in Nova Scotia William D. Carroll (1880–1955), American politician in Wisconsin William G. Carroll (1893–1969), American politician in New York William T. Carroll (1902–1992), American politician, Lieutenant Governor of Connecticut John William Carroll (1901–1993, American politician in Illinois
Sports Bill Carroll (coach) (died 2009), American pole vaulter and athletics coach Bill Carroll (rower) (fl. 1950), New Zealand rower Billy Carroll (born 1959), Canadian ice hockey player Will Carroll (born 1970), American sportswriter
Others William Henry Carroll (1810–1868), American Civil War Confederate general William K. Carroll (born 1952), American professor of sociology