William Farrell

William Farrell may refer to:


 * William Farrell (architect) (died 1851), Irish architect
 * William Farrell (diver) (born 1934), American Olympic diver
 * William Farrell, Irish-Canadian businessman and a founder of the British Columbia Telephone Company
 * Willie Farrell (1928–2010), Irish politician
 * Bill Farrell (baseball), baseball player
 * Bill Farrell (singer) (1926–2007), American singer in the 1940s–1950s
 * Billy Farrell (footballer), League of Ireland player