Pierrefitte-sur-Seine is a commune in the Seine-Saint-Denis department and Île-de-France region of France. Today forming part of the northern suburbs of Paris, Pierrefitte lies 12.4 km from the centre of the French capital. It is set to merge into Saint-Denis on 1 January 2025, following a vote of both municipal councils on 30 May 2024. The new commune will be the second most populated in Île-de-France after Paris.