Sidonie Dumas (née Sidonie Rebecca Seydoux Fornier de Clausonne; born 28 April 1967 in Boulogne-Billancourt) is a French film and television producer. She has been the CEO of Gaumont since 2004 and its majority shareholder through the family holding company Ciné Par since 2017. A member of the Seydoux family, she is the daughter Nicolas Seydoux, niece of Pathé chairman Jérôme Seydoux and cousin of actress Léa Seydoux.

In 2014, she was ranked first by Télérama on their list of the "Top 50" people in French cinema who "have the power and the talent to raise money, create films, make them popular". In 2024, she received the International Emmy Directorate Award.

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