AP205 Amancio Williams is dedicated to the work of Argentinian architect Amancio Williams (1913–1989), one of the key figures of modern architecture in Latin America. His most famous project, Casa sobre el Arroyo in the province of Buenos Aires, is one of his few built works. The vast range of projects and proposals produced by his office between the 1940s and the 1980s is instead attested to by an extensive archive of drawings, photographs, correspondence, and models, donated to the Canadian Centre for Architecture by the Williams family in 2020. The publication features research by Studio Muoto, Claudia Shmidt, and Pezo von Ellrichshausen, who each possess distinct backgrounds in architectural practice and history. Together, their readings present new and expanded understandings of Williams’s work and situate social, material, and political dimensions of his practice within contemporary architectural discourse.