Alexander Porter Butterfield (born April 6, 1926) is an American retired military officer, public servant, and businessman. He served as the deputy assistant to President Richard Nixon from 1969 to 1973. He revealed the White House taping system's existence on July 13, 1973, during the Watergate investigation, but had no involvement in the scandal. From 1973 to 1975, he served as administrator of the Federal Aviation Administration.