The Musée des Collections Historiques de la Préfecture de Police, also known as the Musée de la Préfecture de Police, is a museum of police history in the 5th arrondissement of Paris, France. It is located in the Hôtel de police at 4, rue de la Montagne-Sainte-Geneviève. The museum is open daily except Sunday; admission is free. The museum was originally started by prefect Louis Lépine for the Exposition Universelle, and has gradually grown through subsequent years.