The Fin-de-Siècle Museum (French: Musée Fin-de-Siècle, Dutch: Fin-de-Siècle Museum, "Museum of the Turn of the Century") is a museum in Brussels, Belgium. It is dedicated to the full spectrum of the arts of the period between 1884, when the Société Libre des Beaux-Arts ("Free Society of Fine Arts") was founded Brussels, and 1914, the year of the outbreak of World War I. It is one of the constituent museums of the Royal Museums of Fine Arts of Belgium. The museum opened on 6 December 2013.