John Thayer

John Thayer may refer to:

Politicians

 * 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

Others

 * 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