Réaumur - Sébastopol is a station of the Paris Métro, serving Line 3 and Line 4 in the 2nd arrondissement of Paris. Fare Zone: 1.

The station was opened as Rue Saint-Denis on 19 October 1904 as part of the first section of the line 3 between Père Lachaise and Villiers. It was renamed to the current name in 15 October 1907. It is named after the streets of Rue Réaumur and the Boulevard de Sébastopol, which are named after the scientist René-Antoine Ferchault de Réaumur and for the port of Sevastopol in Ukraine, the scene of the Siege of Sevastopol (1854–1855) during the Crimean War.