What is the name of the Art Nouveau movement in Catalonia?

The Art Nouveau movement in Catalonia is called Modernisme.

Modernisme, also called Catalan modernism or Catalan Art Nouveau, developed in Catalonia around the turn of the 20th century. It was not only an architectural style: it also influenced literature, painting, sculpture, furniture, ceramics, textiles, metalwork, glass, and interior design.

The movement grew alongside Catalonia’s industrial expansion and the cultural revival known as the Renaixença. Many artists and patrons wanted to modernize Catalan culture while expressing a distinct regional identity. Barcelona became its principal center, with architects such as Antoni Gaudí, Lluís Domènech i Montaner, and Josep Puig i Cadafalch producing its best-known buildings.

Modernisme is related to other European names for Art Nouveau, including Jugendstil in German-speaking countries and Vienna Secession in Austria. Those terms are not interchangeable answers to this question because they identify different regional traditions. Modernisme is the specifically Catalan name.