John Downey

• John G. Downey, Governor of California
• John T. Downey, former CIA officer shot down over communist China and imprisoned for two decades
• John V. Downey, New York politician
• John W. Downey, contemporary classical composer
• John Downey (Iowa politician), Irish-born American politician in Iowa
• John Downey (RAF officer)
• John Anthony Downey, accused of carrying out the Hyde [Park and Regent's Park bombings|Hyde Park bombing] in 1982