// Workers AI · dad joke modeIs John Duffy a baker? No, he kneads the data.

John Duffy may refer to:

Sportspeople

• John Duffy (footballer, born 1886) (1886–?), English football centre half for Bradford City
• John Duffy (footballer, born 1922) (1922–1996), Scottish football right back for Clyde and Norwich
• John Duffy (footballer, born 1929) (1929–2004), Scottish football wing half for Celtic, Arbroath and Southend
• John Duffy (footballer, born 1943), Scottish football wing half for Raith, Dunfermline, Darlington and Australian clubs
• John Duffy (Gaelic footballer), Gaelic football player
• John Duffy (rugby league) (born 1980), rugby league player
• John Duffy (soccer) (1905–1984), American soccer player

Others

• John Duffy (composer) (1926–2015), American composer
• John Duffy (economist) (born 1964), American economist
• John Duffy (mobster) (died 1924), American gang member, member of the North Side Gang
• John Duffy (writer), Canadian writer and political strategist
• John Duffy and David Mulcahy (both born 1959), the Railway Rapists, British rapists and murderers
• John A. Duffy (1884–1944), American bishop
• John F. Duffy (born 1963), legal academic
• John Gavan Duffy (1844–1917), Australian politician
• John J. Duffy, American Medal of Honor recipient
• John J. Duffy Jr. (1933–2019), American criminal defense attorney
• John Duffy (medical historian) (1915–1996), University professor & author of several books on U.S. medical history

See also

• Jack Duffy (actor) (1882–1939), American film actor
• Jack Duffy (1926–2008), Canadian entertainer