John Mortimer (disambiguation)

John Mortimer (1923–2009) was a British writer.

John Mortimer may also refer to:
 * John B. Mortimer, Hong Kong judge
 * Jack Cade, leader of the Kent rebellion
 * John Mortimer (musician), in heavy metal band Holocaust
 * John Mortimer (MP) for Northamptonshire
 * John Robert Mortimer (1825–1911), archaeologist
 * John Mortimer (agriculturalist) (1656–1736), English merchant and writer on agriculture
 * John Hamilton Mortimer (1740–1779), British painter and printmaker
 * John Jay Mortimer (1933–2013), American financier