Harry Thayer may refer to:
Harry Bates Thayer (1858–1936), businessman Harry E. T. Thayer (1927–2017), diplomat Harry Irving Thayer (1869–1926), Congressman from Massachusetts Harry Thayer (American football, born 1873) (1873–1936), All-American football player Harry Thayer (American football executive) (1907–1980), American football executive
See also Thayer (disambiguation)