A
- Amazonia 2000 Collection
- Arango, Jorge (1916-2007). Jorge Arango Papers
- Archigram Magazine and Ephemera Collection
B
- Bakanowsky Collection of Le Corbusier Exhibition Posters
- Barnes, Edward Larrabee (1914-2004). The Edward Larrabee Barnes Collection
- Baum, William M. The William M. Baum Collection
- Beals, Jessie Tarbox (1870-1942). Jessie Tarbox Beals Photographs of Houses and Gardens
- Bennet, Richard Marsh (1907- ) The Richard Marsh Bennett Collection
- Binet, Hélène. Encounters with Cities Photograph Collection
- Blossom, Harold Hill (1879-1935). The Harold Hill Blossom Collection
- Bogner, Walter (1899-1993). The Walter Bogner Collection
- Bolles, John Savage. The John S. Bolles Collection
- Breuer, Marcel (1902-1981). Marcel Breuer Lectures Collection
- BTA Architects, Inc. (1966-2016). BTA Collection
- Burle Marx, Roberto (1909-1994). Roberto Burle Marx Collection
C
- Camp Pendleton Study Research Files
- Carpenter, James (1949- ). The James Carpenter Collection
- CIAM. Papers of the Congrès Internationaux d'Architecture Moderne
- Finding Aid Available [Collection completely digitized]
- Clay, Grady E. (1916-2013). The Grady E. Clay Collection
- Cole, Doris and Hal Goyette. The Doris Cole and Hal Goyette Collection
- Collins, Christianne C. The Christianne Crasemann Collins Research Collection
- Collins, George Roseborough (1917- ). The George Collins Collection on Linear City Planning
- Comey, Arthur Coleman (1886- ). Papers of Arthur Coleman Comey
- Conant, Kenneth John (1894- ). The Cluny Collection
- Cossutta, Araldo. Papers of Araldo Cossutta
- Curutchet Collection, 1949-1979
