Lamarck — Caulaincourt is a station on Line 12 of the Paris Métro in the Montmartre district and the 18th arrondissement. The station has a very picturesque single entry (shown in the film Amélie) which is surrounded by two staircases ascending the hill of Montmartre. The platforms are 25 m below the entrance and are reached by a lift or a spiral staircase.

The station opened on 31 October 1912 as part of the extension of the Nord-Sud company's line A from Pigalle to Jules Joffrin. The station is named after the Rue Lamarck and the Rue Caulaincourt. The station was originally intended to be called Constantin Pecqueur, but it was opened as Lamarck, then changed to Lamarck (Caulaincourt), and finally changed to Lamarck — Caulaincourt. The Rue Lamarck is named after Jean-Baptiste Pierre de Monet, Chevalier de Lamarck (1744–1829) French naturalist who is mainly remembered for his discredited theory of the inheritance of acquired traits. The Rue Caulaincourt is named after the marquis Armand Augustin Louis de Caulaincourt (1773–1827), general, ambassador and Foreign Minister from 1813 to 1814. Fare Zone: 1.