Marine Tondelier is a French politician who has served as the national secretary of The Ecologists since December 2022. She is also an elected official for Hauts-de-France.

Her career includes working as a parliamentary collaborator at the Assemblée Nationale and the Sénat. Earlier in her career, Tondelier held roles such as a trainee in the "Ecologie Hospitalière" service at Greater Paris University Hospitals - Ap-Hp, and as a trainee at the Inspection Générale des Affaires Sociales (IGAS).