1921 in architecture

• March – Puhl & Wagner are contracted to decorate the interior of the Golden Hall (Stockholm City Hall) with neo-Byzantine mosaics designed by Einar Forseth.
• March 21 – Teatro Yagüez in Puerto Rico, designed by José Sabàs Honoré, reopens.
• May 27 – A Buddha image is enshrined in the main hall of the Daifukuji Soto Zen Mission in Hawai'i, as part of a dedication ceremony for the building.{{cite web |url=http://hawaii.gov/dlnr/hpd/register/reghaw.pdf |title=Historic Places in Hawaii County |work=official state web site |accessdate= 2010-04-19 }}
• September 5 – The Cervantes Theatre in Buenos Aires, Argentina, opens with a production of Lope de Vega's La dama boba.[http://www.teatrocervantes.gov.ar/sitio/site/home/home.php Teatro Cervantes {{in lang|es}}]
• Hugo Häring and Ludwig Mies van der Rohe submit a competition entry for a Friedrichstrasse office building, fully made of glass.
• Construction work begins on the Watts Towers in Los Angeles, designed by Simon Rodia.

{{See also|Category:Buildings and structures completed in 1921}}

• January 23 – Ohel Rachel Synagogue in Shanghai, China, designed by Robert Bradshaw Moorhead and Sidney Joseph Halse, is dedicated.
• March 3 – New terminal at the Central railway station, Sydney, Australia, complete with clock tower.{{cite web |url=http://sydneytrains.info/about/history/central_station_in-depth |title=Central Station - in-depth history |work=Sydney Trains |publisher=Government of New South Wales |date= |access-date=3 January 2017 |archive-url=https://web.archive.org/web/20130810221634/http://sydneytrains.info/about/history/central_station_in-depth |archive-date=10 August 2013 }}
• May 2 – Cunard Building (New York City), designed by Benjamin Wistar Morris with consultants Carrère and Hastings.
• October 26 – The Chicago Theatre movie palace in the United States.{{cite web| url=http://www.compassrose.org/balaban-and-katz/Chicago-Theatre.html| accessdate=June 13, 2014| publisher=Compass Rose Cultural Crossroads, Inc.| title=Historic Theatres & Movie Palaces of Balaban and Katz: The Chicago Theatre, A Brief History| work=Uptown Chicago Resources (online)| year=2007}}
• October 28 – The Theater Pathé Tuschinski movie/live theatre in Amsterdam, designed by Hijman Louis de Jong.

File:Einsteinturm 7443.jpg]]

• The Einstein Tower near Potsdam, Germany, designed by Erich Mendelsohn.Paul Sigel, Silke Dähmlow, Frank Seehausen und Lucas Elmenhorst, Architekturführer Potsdam – Architectural Guide, Dietrich Reimer Verlag, Berlin 2006, {{ISBN|3-496-01325-7}}.
• Berliner Tageblatt, designed by Erich Mendelsohn.
• Harkness Tower in Yale University in New Haven, Connecticut, United States, after 4 years of construction.
• The Corn Palace in Mitchell, South Dakota, United States is completed (except for domes added in 1937).
• The Wong Tai Sin Temple (Hong Kong) is moved to its current site and completed.
• New Hindu Durgiana Temple in Amritsar.
• Michel de Klerk's Het Schip housing development for Eigen Haard in Amsterdam.
• Monument to the March Dead (Denkmal der Märzgefallenen), by Walter Gropius in Weimar, Germany.
• The Mayslake Peabody Estate in Oak Brook, Illinois, United States.
• Wolseley House (showroom and offices), 160 Piccadilly, London, designed by William Curtis Green.

• Adolf Loos designs a mausoleum for Max Dvořák that is never built.{{cite book|first=Joseph|last=Masheck|title=Adolf Loos: The Art of Architecture|url=https://books.google.com/books?id=26iAtKX8wREC|date=2013-05-15|publisher=I.B.Tauris|isbn=978-1-78076-423-8|page=254}}

• American Academy of Arts and Letters Gold Medal – Cass Gilbert.
• RIBA Royal Gold Medal – Edwin Lutyens.

• January 15 – Ulrich Franzen, German-born American "Brutalist" architect,Vitello, Paul (14 October 2012). [https://www.nytimes.com/2012/10/14/arts/design/ulrich-franzen-architect-of-new-york-buildings-dies-at-91.html Ulrich Franzen, Designer of Brutalist Buildings, Dies at 91], The New York Times in Düsseldorf (died 2012)
• February 26 – Angelo Mangiarotti, Italian architect and industrial designer, in Milan (died 2012)
• March 14 – Ada Louise Huxtable, New York architecture critic and writer (died 2013)
• July 22 – Colin Madigan, Australian architect (died 2011)
• September 6 – Lyubow Demeetriyevna Oosava, Russian-born Belarusian architect (died 2015)

File:Martin Nyrop.jpg]]

• March 3 – Pierre Cuypers, Dutch church and museum architect (born 1827)
• May 18 – Martin Nyrop, Danish architect of Copenhagen City Hall (born 1849)Funder, Lise (1979). Arkitekten Martin Nyrop. København: Foreningen til gamle Bygningers Bevaring.
• June 1 – Sir Robert Rowand Anderson, Scottish Victorian architect (born 1834)
• December 10 – George Ashlin, Irish ecclesiastical architect (born 1837)

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