Pierre-Antoine Cousteau (18 March 1906 – 17 December 1958) was a French far right polemicist and journalist. He was the brother of the famous explorer Jacques-Yves Cousteau.
He was born in Saint-André-de-Cubzac, Gironde, and educated in the United States as well as the Lycée Louis-le-Grand, Cousteau served in the military before working as a translator and a meteorologist and for New York's Credit Alliance Corporation. He then became a journalist for left-wing papers such as Regards or Monde and was associated with pacifism and the Anti-Stalinist left.
Cousteau abandoned his communism in the early 1930s, and was drawn to anti-Semitism and anti-democracy, writing for Coup de Patte and then Je suis partout, a journal of which he became editor in 1932. In this role he was close to Pierre Gaxotte, who converted him to fascism.
He went to Nazi Germany in 1936 with Robert Brasillach and Georges Blond and then Spain in 1938 with Brasillach and Maurice Bardèche. While the trips helped to develop his fascism, his attendance at the Nuremberg Rally of 1937 left him of the opinion that Nazism was impressive but not without its flaws.