The year 2005 in architecture involved some significant architectural events and new buildings.

• May 17 – The renovation and restoration of Mies van der Rohe's Crown Hall at the Illinois Institute of Technology commences with the smashing of the first of the large glass walls, a privilege auctioned on eBay for over $2,500.
• May 20 – The United States Postal Service honors twelve "Masterworks of Modern Architecture" on first class postage stamps.
• October 6–10 – Demolition of the last of the Xanadu Houses.

• January 15 – Copenhagen Opera House, Denmark, designed by Henning Larsen.
• March 5 – The Kunstmuseum Stuttgart, Germany, designed by Hascher et Jehle.
• April 6 – New facility for the Milan Trade Fair in Milan, Italy, designed by Massimiliano Fuksas.
• April 14 – Casa da Música, Porto, Portugal, designed by Rem Koolhaas's OMA.^[1]
• April 17 – Expansion of the Walker Art Center in Minneapolis, Minnesota, designed by Herzog & de Meuron.^[2]
• April 28 – The Wynn Las Vegas, designed by Jon Jerde.
• May 10 – Memorial to the Murdered Jews of Europe in Berlin, designed by Peter Eisenman.
• May 11 – Southeast Asian Ceramics Museum at Bangkok University, Thailand, designed by Architects 49.
• May 30 – Allianz Arena in Munich, Germany, designed by Herzog & de Meuron.
• June – Zentrum Paul Klee, Bern, Switzerland, designed by Renzo Piano.
• July 22 – Tower of St Edmundsbury Cathedral in Bury St Edmunds, England.
• August 27 – The Turning Torso in Malmö, designed by Santiago Calatrava, the tallest building in Sweden and Scandinavia (2005–present).
• September – Idea Store Whitechapel, London, UK designed by David Adjaye Associates.
• October 8 – Palau de les Arts Reina Sofía, Valencia, designed by Santiago Calatrava.
• October 15 – New de Young Museum in San Francisco, California, USA, designed by Herzog & de Meuron.
• October 17–18 – National Waterfront Museum, Swansea, UK, designed by Wilkinson Eyre.
• October 30 – The reconstructed Dresden Frauenkirche, in Dresden, Germany, is consecrated.
• specific date not listed
  • Bloomberg Tower in Manhattan, New York, United States is completed.
  • 2 Marsham Street in London, designed by Terry Farrell, is first occupied by the British government department, the Home Office, for whom it was built.
  • Maggie's Centre at Inverness in the Scottish Highlands, a drop-in cancer care centre designed by Page\Park Architects.

• date unknown
  • The Chongqing World Trade Center in Chongqing, China.
  • Chelsea Tower in Dubai, United Arab Emirates.
  • Q1 Tower in Surfers Paradise, Queensland, the tallest building in Australia (2005–present).
  • Mirador apartment building in Madrid, Spain, designed by MVRDV and Blanca Lleó.
  • Tromsø Library and City Archives in Norway, designed by Kjell Beite.
  • Jaume Fuster Library in Barcelona, Spain, designed by Josep Llinás.
  • Santa Caterina Market roof in Barcelona, designed by Enric Miralles Benedetta Tagliabue.
  • Antvorskov Church, Slagelse, Denmark, designed by Regnbuen Arkitekter.
  • St. Henry's Chapel, Turku, Finland, designed by Matti Sanaksenaho.
  • Private residences
    • Casa Poli, Concepción, Chile, designed by Pezo von Ellrichshausen.^[3]
    • Casa Tóló, Lugar das Carvalhinhas, Portugal, designed by Álvaro Siza Vieira.^[4]
    • Haus Bold, Bad Waldsee, Germany, designed by Thomas Bendel.^[5]
    • Light House, Notting Hill, London, designed by Gianni Botsford.^[6]

• AIA Gold Medal – Santiago Calatrava
• Architecture Firm Award – Murphy/Jahn
• AIA Twenty-five Year Award – Yale Center for British Art, New Haven, Connecticut by Louis Kahn
• Driehaus Architecture Prize – Quinlan Terry^[7]
• Emporis Skyscraper Award – Turning Torso by Santiago Calatrava
• European Union Prize for Contemporary Architecture (Mies van der Rohe Prize) – Rem Koolhaas for Netherlands Embassy Berlin
• Grand Prix de l'urbanisme – Bernard Reichen
• LEAF Award, Grand Prix – Henning Larsen Architects for the IT University of Copenhagen
• Mies van der Rohe Prize – Rem Koolhaas for the Dutch Embassy (Berlin)
• Praemium Imperiale Architecture Award – Yoshio Taniguchi
• Pritzker Prize – Thom Mayne, of Morphosis
• Prix de l'Équerre d'Argent – Florence Lipsky and Pascal Rollet for the Science Library at Orléans-la-Source
• RAIA Gold Medal – James Birrell
• RIAS Award for Architecture – Scottish Parliament building, Edinburgh, designed by EMBT & RMJM
• RIBA Royal Gold Medal – Frei Otto
• Stirling Prize – Scottish Parliament building, Edinburgh, designed by EMBT & RMJM^[8]
• Thomas Jefferson Medal in Architecture – Shigeru Ban
• Vincent Scully Prize – The Prince of Wales (now Charles III)
• Twenty-five Year Award – Yale Center for British Art
• UIA Gold Medal – Tadao Ando

• January 6 – A. Hays Town, prominent American residential architect based in Baton Rouge, Louisiana (born 1903)
• January 23 – Richard Feilden OBE, leading UK architect based in Bath (born 1950)
• January 25 – Philip Johnson, influential American architect, first Pritzker Prize honoree (born 1906)
• March 16 – Ralph Erskine, British architect, designer of the Byker Wall (born 1914)
• March 22 – Kenzo Tange, leading Japanese architect, winner of the 1987 Pritzker Prize (born 1913)
• June 4 – Giancarlo De Carlo, Italian architect (born 1919
• June 30 – Robert Y. Fleming, American architect (born 1925)
• December 15 – James Ingo Freed, American architect (born 1930)

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