Siza was conferred the title of Honoris Causa Doctor by the following universities: Polytechnic University of Valencia; École Polytechnique Fédérale de Lausanne; University of Palermo; University Menendez Pelayo, in Santander; Universidad Nacional de Ingeniería in Lima, Peru; University of Coimbra; Lusíada University of Porto; Universidade Federal de Paraíba; the Università degli Studi di Napoli Federico II, Polo delle Scienze e delle Tecnologie, in Naples; the University of Architecture and Urbanism of Bucharest "Ion Mincu", Romania (2005); and the University of Pavia, Italy (2007). He is a member of the American Academy of Arts and Sciences as well as Honorary Fellow of the Royal Institute of British Architects, the American Institute of Architects, the "Académie d'Architecture de France" and the European Academy of Sciences and Arts.