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, co-host of Prime Time Sports
• John W. Shannon (born 1933), United States Under Secretary of the Army
• John Shannon (American football) (born 1965), American football defensive lineman
• John Shannon (NASA administrator), American administrator who presented the Shuttle-Derived Heavy Lift Launch Vehicle to the Augustine Commission

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