William, Will, Bill or Billy Griffiths may refer to:
Sports
- William Griffiths (boxer) (born 1932), Australian Olympic boxer
- William Griffiths (field hockey) (1922–2010), British Olympic hockey player
- Will Griffiths (rugby union) (born 1998), Welsh rugby union player
- Bill Griffiths (footballer, born 1879) (1879–1928), Australian rules footballer
- Bill Griffiths (footballer, born 1896) (1896–1970), Australian rules footballer
- Billy Griffiths (footballer, born 1876), (1876–1946), English footballer
Others
- William Griffiths (VC) (1841–1879), Irish recipient of the Victoria Cross
- William Griffiths (politician) (1912–1973), British politician
- Hugh Griffiths, Baron Griffiths (William Hugh Griffiths, 1923–2015), British soldier, cricketer, judge and life peer
- William Garonwy Griffiths (born 1955), American author
- Bill Griffiths (poet) (1948–2007), British poet and scholar
- Billy Griffiths (writer), Australian historian and writer
See also
- Billy Griffith (Stewart Cathie Griffith, 1914–1993), cricketer and cricket administrator
- Robert William Griffiths (1896–1962), Welsh farmer and businessman
- William Griffith (disambiguation)
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