Casa Amatller (Catalan pronunciation: [ˈkazə əməˈʎːe]) is a building in the Modernisme style in Barcelona, designed by Josep Puig i Cadafalch. Along with Casa Batlló and Casa Lleó-Morera, it makes up the three most important buildings in Barcelona's famous Illa de la Discòrdia ("Block of Discord"), noted for its unique modernist buildings. The building was originally designed as a residence for chocolatier Antoni Amatller and was constructed between 1898 and 1900.