The year1790 in architecture involved some significant architectural events and new buildings.

• date unknown – Work begins on theEast India Company'sPlantation House inSaint Helena, which remains the official residence of the Governor.

• New church of the Abbey of St Genevieve in Paris, designed byJacques-Germain Soufflot and finished byJean-Baptiste Rondelet, is completed to serve as thePanthéon.
• Estrela Basilica inLisbon.
• All Saints church,Wellington, Shropshire, England, designed byGeorge Steuart.
• Royal Observatory inMadrid, designed byJuan de Villanueva.
• Härnösand Residence in Sweden.
• ThePitot House,New Orleans built by Don Santiago Lorreins (bought byJames Pitot in 1809).
• TheJohn Dodd Hat Shop inDanbury, Connecticut, built by lawyer John Dodd.
• The bridge atWarwick Castle, England.
• Monmouth County Gaol, UK, designed byWilliam Blackburn.^[1]

• May 4 –Archibald Simpson, Scottish architect practicing in Aberdeen (died1847)
• November 7 –Karol Podczaszyński, Polish neoclassical architect (died1860)

• February 16 –John Hawks, American architect (born c.1731)^[2]
• November 11 –Nicolò Pacassi, Austrian architect (born1716)

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