Pierre-Romain Thionnet (; born 19 January 1994) is a French politician of the National Rally (RN) who was elected a Member of the European Parliament (MEP) in 2024.
Thionnet was a member of the Regional Council of ÃÂle-de-France. He was the chief of staff of Jordan Bardella. He was president of Rassemblement national de la jeunesse, the youth organization of the French National Rally. Thionnet was a candidate in Marne's 5th constituency in the 2022 French legislative election but was defeated in the second round by longstanding Member of Parliament Charles de Courson.
He became a Member of the European Parliament in the 2024 European Parliament election.