William Flynn

William, Bill or Billy Flynn may refer to:

Arts and entertainment

 * Billy Flynn (Chicago) (fl. 1926), fictional lawyer from the musical Chicago
 * Bill Flynn (1948–2007), South African film and theater actor and comedian
 * Billy Flynn (musician) (born 1956), American Chicago blues guitarist
 * Billy Flynn (actor) (born 1985), American actor

Law and politics

 * William J. Flynn (1867–1928), American director of the Bureau of Investigation
 * William S. Flynn (1885–1966), American politician; Governor of Rhode Island
 * Bill Flynn (Florida politician) (1917–1984), American politician in the Florida House of Representatives
 * Bill Flynn (New Jersey politician) (born 1938), American politician in the New Jersey General Assembly
 * Bill Flynn (Australian politician) (1951–2011), Queensland MP and leader of One Nation

Sports

 * William Flynn (golfer) (1890–1944), American golf course architect
 * William Flynn (American football) (died 1958), American football coach
 * Bill Flynn (footballer) (1907–1991), Australian rules footballer
 * William J. Flynn (athletic director) (died 1997), American college athletics administrator

Others

 * William Flynn (1926–2018), CEO, chairman, then chairman emeritus of Mutual of America
 * William "Billy" Flynn, responsible for the murder of Gregory Smart, the husband of Pamela Smart