John Thayer may refer to:

• John R. Thayer (1845–1916), member of the United States House of Representatives from Massachusetts
• John A. Thayer (1857–1917), member of the United States House of Representatives from Massachusetts
• John Milton Thayer (1820–1906), United States Senator from Nebraska and Civil War general

• John Thayer (priest) (1755–1815), Boston priest
• John B. Thayer (1862–1912), American cricketer and businessman who died on the RMS Titanic
• Jack Thayer (1894–1945), his son, survivor of the Titanic sinking
• Jack G. Thayer (1922–1995), American radio executive and disc jockey
• John Thayer (ornithologist) (1862–1949), American amateur ornithologist
• John M. Thayer (judge), Connecticut Supreme Court judge

• John Theyer (1597–1673), English royalist lawyer and writer, antiquary and bibliophile
• Thayer (disambiguation)

Topics referred to by the same term

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