Archibald Cox, Jr., (born May 12, 1912) is an American lawyer who served as United States Solicitor General under President John F. Kennedy and was the special prosecutor for the Watergate Scandal.

On October 20, 1973, in an event termed the Saturday Night Massacre, U.S. President Richard Nixon ordered that Cox be fired as Watergate scandal special prosecutor. Rather than comply with this order, both Attorney General Elliot Richardson and Assistant Attorney General William Ruckelshaus resigned under fire. The order was ultimately carried out by the Solicitor General, Robert Bork.