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