The year 1912 in architecture involved some significant architectural events and new buildings.

• Clough Williams-Ellis receives his first major architectural commission, for the remodelling of Llangoed Hall in Wales.

• Electric Tower, in Buffalo, New York, designed by Esenwein & Johnson^[1]
• April 19 – Bridges in Constantine, Algeria:
  • Sidi M'Cid Bridge, designed by Ferdinand Arnodin.
  • Sidi Rached Bridge, designed by Paul Séjourné.
• April 25 – Rebuilt St Mark's Campanile in Venice inaugurated.
• May – Pushkin Museum of Fine Arts opens in Moscow, Russia.
• June – Government Conference Centre, Ottawa, Ontario, Canada (opened by the Grand Trunk Railway as Ottawa's railway station)^[2]
• October 12 – Quarr Abbey on the Isle of Wight (England), designed by Dom Paul Bellot, consecrated.
• December 26 – Opening of:
  • Manchester Opera House, in Manchester, England, as the New Theatre, designed by Richardson & Gill with Farquarson.^[3]
  • St. James Theatre, Wellington, New Zealand, designed by Henry Eli White.

• Alexander Nevsky Cathedral, Sofia, Bulgaria.
• Mysore Palace, India, designed by Henry Irwin.
• El Centro Español de Tampa, Florida, USA.^[4]
• Mawson's Huts, Cape Denison, Commonwealth Bay, Australian Antarctic Territory^[5]
• Šaloun's Villa in Prague, designed by and for sculptor Ladislav Šaloun.
• The Salutation, Sandwich, Kent, England, designed by Edwin Lutyens with garden by Gertrude Jekyll.
• Sons of Norway Hall, Petersburg, Alaska, USA.^[6]
• Glamorgan County Hall, Cardiff, Wales, designed by Vincent Harris and T. A. Moodie.
• Chengyang Bridge, China.
• Jackson Tower in Portland, Oregon
• The Fairmont Copley Plaza Hotel in Boston, Massachusetts
• Sun Tower in Vancouver, British Columbia, Canada
• Montreal Museum of Fine Arts in Montreal, Quebec, Canada
• Ritz-Carlton Montreal in Montreal, Quebec, Canada

• Olympic gold medal – Eugène Monod & Alphone Laverrière of Switzerland for Building plan of a modern stadium.
• RIBA Royal Gold Medal – Basil Champneys.
• Grand Prix de Rome, architecture: Jacques Debat-Ponsan.

• January 9 – Ralph Tubbs, British architect associated with the Festival of Britain (died 1996)
• January 30 – Finn Juhl, Danish architect, interior and industrial designer (died 1989)
• February 21 – Henry Bernard, French architect, designer of the Palace of Europe (died 1994)
• March 12 – Gordon Tait, British architect (died 1999)
• June 11 – Rosemary Stjernstedt, British architect (died 1998)
• December 1 – Minoru Yamasaki, American World Trade Center architect (died 1986)
• December 15 – Ray Eames, American designer, 2nd wife of Charles Eames (died 1988)

• February 8 – Constant-Désiré Despradelle, French architect and professor of architecture (born 1862)
• June 1 – Daniel Burnham, American architect and urban planner (born 1846)
• June 27 – Frank Furness, Philadelphia-based American architect (born 1839)
• November 17 – Richard Norman Shaw, British architect (born 1831)