Luis Lacasa Navarro (1899 – 30 March 1966) was a Spanish architect. His work in Spain and Paris before and during the Spanish Civil War (1936–39) was rationalist and functional. He is best known as co-designer of the Spanish Pavilion at the 1937 Paris Exposition, a work designed to showcase the modern legitimacy of the embattled Spanish Republic. After the war he went into exile in the Soviet Union.