title: John Callaghan
text: # John Callaghan
  
  John Callaghan may refer to:
  
  * John Callaghan (physician) (1923–2004), Canadian cardiac surgeon
  * John Callaghan (Galway), Irish murder victim
  * John Callaghan (musician) (born 1969), British musician
  * John Callaghan (screenwriter), see List of Republic of Doyle episodes
  * John Callaghan (footballer), see List of Sheffield Wednesday F.C. players
  