The Castel Béranger is a residential building with thirty-six apartments located at 14 rue de la Fontaine in the 16th arrondissement of Paris. It was designed by the architect Hector Guimard, and built between 1895 and 1898. It was the first residence in Paris built in the style known as Art Nouveau.

Hector Guimard was a French architect and designer, and a prominent figure of the Art Nouveau style. He achieved early fame with his design for the Castel Beranger, the first Art Nouveau apartment building in Paris, which was selected in an 1899 competition as one of the best new building facades in the city. He is best known for the glass and iron edicules or canopies, with ornamental Art Nouveau curves, which he designed to cover the entrances of the first stations of the Paris Metro.