John McGlashan may refer to:

• John McGlashan (politician) (1802–1864), New Zealand lawyer, politician and educationalist
  • John McGlashan College, boarding school for boys in Dunedin, New Zealand, named for the above
• John McGlashan (footballer) (1967–2018), Scottish football player and manager
• John Glashan (born John McGlashan, 1927–1999), Scottish cartoonist, illustrator and playwright

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