John Knox Marshall (born April 9, 1942 in Santiago, Chile) is an American competitive sailor and Olympic medalist.

He won a bronze medal in the Dragon class at the 1972 Summer Olympics in Munich, together with Donald Cohan and Charles Horter.

[2] Marshall was involved in the 1983 America's Cup as a mainsheet trimmer on board Liberty.

[4][5] For the 2000 Louis Vuitton Cup, the Young America syndicate represented the New York Yacht Club.

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