1850 in architecture

The year 1850 in architecture involved some significant architectural events and new buildings.

• November 1 – Foundation stone laid for church of All Saints, Margaret Street, London, designed by William Butterfield. supervised by Beresford Hope for the Cambridge Camden Society as a model of the High Victorian Gothic ecclesiological style.

• Bratsberg Church, Trondheim, Norway.
• Hillsgrove Covered Bridge, Pennsylvania, USA.
• Britannia Bridge in North Wales, engineered by Robert Stephenson, is opened.
• Newcastle railway station in the north-east of England, designed by John Dobson, is opened.
• Sainte-Geneviève Library in Paris, designed by Henri Labrouste, is completed, the first major public building with an exposed cast-iron frame.
• Château de Boursault, France, designed by Jean-Jacques Arveuf-Fransquin.
• Peckforton Castle, England, designed by Anthony Salvin.
• Vĩnh Tràng Temple, Mỹ Tho, Vietnam.

• Grand Prix de Rome, architecture – Victor Louvet
• RIBA Royal Gold Medal – Charles Barry

• January 10 – John Wellborn Root, Chicago-based US architect (died 1891)
• February 17 – Frank Darling, Canadian architect associated with Toronto (died 1923)
• November 15 – Victor Laloux, French Beaux-Arts architect and teacher (died 1937)
• December 21 – Lluís Domènech i Montaner, Spanish-Catalan architect, a leader of Modernisme català, the Catalan Art Nouveau/Jugendstil movement (died 1927)
• Robert Worley, English architect (died 1930)

• February 19 – François Debret, French architect (born 1777)
• March 2 – Auguste-Henri-Victor Grandjean de Montigny, French architect influential in Brazil (born 1776)
• May 8 – Antonio Niccolini, Italian architect, scenic designer, and engraver (born 1772)
• July 12 – Robert Stevenson, Scottish lighthouse engineer (born 1772)
• September 5 — John Holden Greene, American architect based in Providence, Rhode Island (born 1777)