Fin-de-Siècle Museum, Art museum in Brussels, Belgium.

The Fin-de-Siècle Museum occupies former halls of the Royal Museum of Modern Art at 1, place Royale/Koningsplein, in Brussels' Royal Quarter, as one of the constituent museums of the Royal Museums of Fine Arts of Belgium. Its galleries hold paintings, sculptures, photography and decorative arts from 1884 to 1914, including the Gillon-Crowet collection of Art Nouveau furniture and works by Louis Majorelle and Alphonse Mucha.

The museum opened in 2013 and focuses on a period when Brussels became a major center for artistic innovation and cultural exchange across Europe. This time span marked a turning point when artists began challenging traditional methods with radical new experiments.

The museum's name refers to the turn of the century, and its scope runs from 1884, when the Société Libre des Beaux-Arts was founded in Brussels, to 1914. The Gillon-Crowet gallery holds Art Nouveau furniture and decorative arts, with pieces by Louis Majorelle, Alphonse Mucha and Philippe Wolfers alongside designs by Victor Horta and Henry Van de Velde.

The museum is at 1, place Royale/Koningsplein in the Royal Quarter, partly in the former halls of the Royal Museum of Modern Art. Metro lines 1 and 5 stop at Parc–Gare centrale; tram 92 and 93 and buses 71, 27 and 95 serve Royale. The Gillon-Crowet Art Nouveau furniture collection is in its own gallery.

The Gillon-Crowet gallery holds Art Nouveau furniture and decorative arts, including pieces by Louis Majorelle, Alphonse Mucha and Philippe Wolfers. The museum also displays work by architects Victor Horta and Henry Van de Velde, and by silversmith Philippe Wolfers.