John Prendergast may refer to:
- John Prendergast (priest) (fl. 1583–1610), Dean of Lismore and prebendary of Cashel
- John Patrick Prendergast (1808–1893), Irish historian
- John Prendergast (artist) (1815–?), British born painter
- John Prendergast (British Army officer) (1910–2008), British army officer
- John Vincent Prendergast (1912–1993), British senior colonial policeman and intelligence officer
- John Robert Prendergast, Canadian football player (died 2016)
- John Barry Prendergast (1933–2011), better known as John Barry (composer), composer of film soundtracks, including many James Bond films
- John Prendergast (activist) (born 1963), American human rights activist
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