Others
- John Thayer (priest) (1755–1815), Boston priest
- John Thayer (cricketer) (1862–1912), American cricketer and businessman that died on the RMS Titanic
- Jack Thayer (1894–1945), his son, survivor of the Titanic sinking
- John Thayer (ornithologist) (1862–1949), American amateur ornithologist
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