John Shannon may refer to: John Shannon (politician) (1862–1926), Australian politician John Shannon (musician) (born 1980), American modern folk guitarist, vocalist, and composer John Shannon (novelist) (born 1943), American author, lately of detective fiction John Shannon (sportscaster) (born 1956), Canadian sportscaster & television producer John W. Shannon (1933–2017), United States Under Secretary of the Army John Shannon (defensive lineman) (born 1965), American football player John Shannon (long snapper), American football player John Shannon (NASA administrator), American administrator who presented the Shuttle-Derived Heavy Lift Launch Vehicle to the Augustine Commission