Juliet Stuart Poyntz (originally 'Points') (25 November 1886 – 1937) was an American suffragist, feminist, trade unionist and communist.
As a student and university teacher, she espoused many radical causes and went on to become a co-founder of the Communist Party of the United States (CPUSA).
Later she left CPUSA and began working as an intelligence agent for the Soviet Union.
Poyntz travelled secretly to Moscow in 1936, just as some of her comrades were being executed in Joseph Stalin's Great Purge, and she resigned from the party.