Justice Thayer may refer to:
Andrew J. Thayer (1818–1873), associate justice of the Oregon Supreme Court John M. Thayer (judge) (1847–1923), associate justice of the Connecticut Supreme Court W. Stephen Thayer III (born 1946), associate justice of the New Hampshire Supreme Court W. W. Thayer (1827–1899), chief justice of the Oregon Supreme Court
See also Judge Thayer (disambiguation)