1940 in architecture

• Oscar Niemeyer begins to design landmark public buildings around the artificial lake of Pampulha in Belo Horizonte, state of Minas Gerais in southeastern Brazil.
• The last of the White Pine Series of Architectural Monographs, begun in 1916, is published.
• Thomas Sharp's Pelican book Town Planning is published in the United Kingdom.
• November 9 – Major fire at Castle Howard in England.Hull Daily Mail (1940-11-11) p.3.

File:Crkva Svetog Marka u Beogradu.jpg, Serbia]]

File:Grundtvigskirken-vest-2005-3.jpg in Copenhagen, Denmark]]

• Igreja Nossa Senhora do Brasil in São Paulo, Brazil.{{cite book|last=Ponciano|first=Levino|title=Bairros Paulistanos de A a Z|url=https://books.google.com/books?id=h5hmnvAipAwC&pg=PA12|accessdate=2012-08-30|year=2001|publisher=Senac|isbn=978-85-7359-223-8|page=12}}
• St. Mark's Church, Belgrade, Serbia.
• Church of St. Michael, Črna Vas, Slovenia, designed by Jože Plečnik.
• Timișoara Orthodox Cathedral, Timișoara, Romania.
• Grundtvig's Church, Bispebjerg, Copenhagen, Denmark, designed by Peder Vilhelm Jensen-Klint (d.1930) in 1913 and completed by his son Kaare Klint.
• Church of the Divine Unity, Newcastle upon Tyne, England, designed by Cackett, Burns Dick and Mackellar.
• Church and Priory of Christ the King, Cockfosters, London, designed by Dom Constantine Bosschaerts.
• Raleigh Hotel in Miami Beach, Florida, United States, designed by Lawrence Murray Dixon.
• Replacement Llao Llao Hotel at San Carlos de Bariloche, Argentina, designed by Alejandro Bustillo.
• Civic Centre of San Carlos de Bariloche, Argentina, designed by Ernesto de Estrada.
• New Bodleian Library in the University of Oxford, England, designed by Sir Giles Gilbert Scott.
• Atatürk Bridge, Istanbul, Turkey (the fourth bridge on this site).{{cite web|url=http://www.turkcebilgi.com/ansiklopedi/unkapanı_köprüsü|title=Türkçe Bilgi: Unkapanı Atatürk Köprüsü|language=Turkish}}
• Eastern Michigan Motorbus Terminal in Ann Arbor, United States, designed by Banfield and Cumming with Douglas Loree.
• Detroit Arsenal (Warren, Michigan) Tank Plant, designed by Albert Kahn.
• Walton Yacht Works at Walton on Thames, England, designed by Jane Drew.
• No. 4 Boathouse at HMNB Portsmouth, England, designed by E. A. Scott.

• American Academy of Arts and Letters Gold Medal – William Adams Delano.
• RIBA Royal Gold Medal – Charles Voysey.

• January 14 – Helmut Jahn, German-American architect
• March 26 – Jörg Streli, Austrian architect and academic (died 2019)
• May 31 – Lebbeus Woods, American architect and artist (died 2012){{cite web|url=http://www.archdaily.com/288469/lebbeus-woods-experimental-architect-dies/|title=Lebbeus Woods, Experimental Architect, Dies|work=archdaily.com|accessdate=2012-10-30}}
• June 24 – Claude Vasconi, French architect (died 2009)
• September 3 – Frank Duffy, British architect

File:John A. Pearson.jpg]]

• February 27 – Peter Behrens, German architect and designer (born 1868)
• March 24 – Thomas Adams, British urban planner (born 1871)
• June 11
• Alfred S. Alschuler, Chicago architect (born 1876)
• John A. Pearson, Canadian architect (born 1867)
• August 22 – Paul Gösch, German artist, architect, lithographer and designer (born 1885)
• October 20 – Gunnar Asplund, Swedish Nordic Classicist architect (born 1885)
• December 13 – Marc Camoletti, Swiss architect (born 1857)

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