Marc Plantegenest (; 11 June 1943 – 6 May 2026) was a French politician who was an independent aligned with the Socialist Party (PS).
Plantegenest served as a deputy in the National Assembly from 1978 to 1981 before joining the Senate from 1981 to 1986. He was also mayor of Saint-Pierre from 1998 to 2001. In 1981, he supported the candidacy of Valéry Giscard d'Estaing in the presidential election.
Plantegenest died on 6 May 2026, at the age of 82.
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