William Flynn
William, Bill or Billy Flynn may refer to:
Arts and entertainment
- Billy Flynn (Chicago), fictional lawyer from the musical Chicago
- Bill Flynn, South African film and theater actor and comedian
- Billy Flynn (musician), American Chicago blues guitarist
- Billy Flynn (actor), American actor
Law and politics
- William J. Flynn, American director of the Bureau of Investigation
- William S. Flynn, American politician; governor of Rhode Island
- Bill Flynn (Florida politician), American politician in the Florida House of Representatives
- Bill Flynn (New Jersey politician), American politician in the New Jersey General Assembly
- Bill Flynn (Australian politician), Queensland MP and leader of One Nation
Sports
- William Flynn (golfer), American golf course architect
- William Flynn (American football), American football coach
- Bill Flynn (footballer), Australian rules footballer
- William J. Flynn (athletic director), American college athletics administrator
Others
- William J. Flynn (businessman), American businessman and activist for peace in Northern Ireland
- William "Billy" Flynn, responsible for the murder of Gregory Smart, the husband of Pamela Smart