The year1785 in architecture involved some significant architectural events and new buildings.

• May 20 – The United StatesLand Ordinance of 1785 determines the layout of townships in the western territories.
• July 17 – A groundbreaking ceremony is held for thePella Palace in Russia, designed byIvan Starov; it will never be completed.^[1]

• May 19 –Plaza de Toros de Ronda, Spain.
• September 7 –Notre-Dame de Guebwiller inaugurated.
• Attingham Park,Shropshire,England, designed byGeorge Steuart.
• Chertsey Bridge over theRiver Thames in England, designed byJames Paine andKenton Couse.
• Marble Palace inSaint Petersburg,Russia, designed byAntonio Rinaldi.
• Church of St. Stephen Harding in Apátistvánfalva.
• Odigitrievsky Cathedral inUlan Ude, Russia.^[2]
• Palace of Iturbide inMexico City, designed byFrancisco Antonio de Guerrero y Torres.
• Grand Palace,Bangkok, completed.
• Rebuilding ofBabolovo Palace inTsarskoe Selo, Russia, by Ilya Neyelov.
• Modifications toNeue Kirche, Berlin, by Georg Christian Unger after a design byCarl von Gontard.
• Mussenden Temple on the north coast of Ireland.

• October 29 –Achille Leclère,French architect (died1853)
• William Cubitt, English civil engineer (died1861)

• August 11 –Marie-Joseph Peyre, French architect (born1730)
• September 26 –Ventura Rodríguez, Spanish architect and artist (born1717)

• 1785 works
• Years in architecture
• 1780s architecture

• Articles with short description
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