William, Willie, Billy, Bill, or Will named McFarland or MacFarland may refer to:

Musicians

• Bill McFarland, American trombonist who played for Southside Movement in 1973–75
• Will McFarland, American guitarist on 1979's Dream Master (album)#Credits and personnel

Politicians

• William Hamilton MacFarland (1799–1872), American legislator from Virginia
• William McFarland (Tennessee politician) (1821–1900), American politician from Tennessee
• William M. McFarland (1848–1905), American politician from Iowa
• William McFarland, Canadian alderman who won in 1935 Hamilton, Ontario municipal election#Aldermen

Sports figures

• Bill MacFarland (1932–2011), Canadian-born American ice hockey player
• Bill McFarland, American football player on 1961 Oklahoma State Cowboys football team
• Willie McFarland, British jockey; 1990 winner of Adonis Juvenile Novices' Hurdle#Winners

Other persons

• Billy McFarland (loyalist), Northern Irish paramilitary, also known as "The Mexican"
• Billy McFarland (fraudster) (born 1991), American convicted felon
• William McFarland (security officer), Sergeant at Arms of the United States House of Representatives