In this rapidly globalizing world, any investigation of architecture inevitably leads to considerations of regionalism. But despite its omnipresence in contemporary practice and theory, architectural regionalism remains a fluid concept, its historical development and current influence largely undocumented. This comprehensive reader brings together over 40 key essays illustrating the full range of ideas embodied by the term. Authored by important critics, historians, and architects such as Kenneth Frampton, Lewis Mumford, Sigfried Giedion, and Alan Colquhoun, Architectural Regionalism represents the history of regionalist thinking in architecture from the early twentieth century to today.