James Thayer

James Thayer may refer to:
 * James Thayer (author) (born 1949), American author
 * James Thayer (Medal of Honor) (1853–1886), United States Navy sailor and Medal of Honor recipient
 * James Bradley Thayer (1831–1902), American legal writer and scholar
 * James B. Thayer (1922–2018), brigadier general in the U.S. Army