John Kaldor (disambiguation)

John Kaldor (born 1936) is an Australian art collector and philanthropist.

John Kaldor or Calder may also refer to:


 * John Kaldor, a character in the 1996 novel Awake and Dreaming by Kit Pearson
 * John Calder (1927–2018), Canadian and Scottish publisher
 * John Calder (cricketer) (1951–2010), New Zealand cricketer
 * John Calder (minister) (1733–1815), Scottish dissenting minister and author