The year 1770 in architecture involved some significant events.

• Radcliffe Infirmary in Oxford, England,^[1] designed by Stiff Leadbetter and John Sanderson, completed
• Shire Hall, Nottingham, England, designed by James Gandon and Joseph Pickford, completed
• New National Mint of Bolivia in Potosí completed
• Palace of Inquisition in Cartagena, Viceroyalty of New Granada, completed about this date
• Liria Palace in Madrid, designed by Ventura Rodríguez, built about this date
• Church of Our Lady of Mount Carmel, Rio de Janeiro, Brazil, probably designed by Manuel Alves Setúbal, consecrated
• Church of Santissimo Nome di Maria e degli Angeli Custodi, Genoa, begun in 1712, completed about this date
• Church of La Magdalena, Getafe, Spain, designed by Alonso de Covarrubias and Juan Gómez de Mora and begun in the 16th century, completed
• Wooden Saint Parascheva Church, Desești, Romania, built
• New Théâtre du Palais-Royal (rue Saint-Honoré), Paris, designed by Pierre-Louis Moreau-Desproux, opened
• New L'Opéra of the Palace of Versailles, France, designed by Ange-Jacques Gabriel, opened
• College Edifice, Brown University, Providence, Rhode Island, designed by Robert Smith of Philadelphia, built
• Somerset House, Park Lane, London, designed and built by John Phillips, completed
• Zois Mansion in Ljubljana, Slovenia, completed
• Summer residences in the Frederiksberg district of Copenhagen, Denmark, built about this date include
  • Rolighed
  • Store Godthåb, probably designed by Johan Christian Conradi
• Temple of Friendship in Sanssouci Park, Potsdam, Prussia, designed by Carl von Gontard, completed
• The Eryilou Fujian tulou in China is built
• Approximate date – Mesi Bridge in Ottoman Albania built

• March 4 – Christian Zais, German architect and city planner (died 1820)
• 1765/1770 – Fryderyk Bauman, Polish architect and sculptor-decorator (died 1845)
• Approximate date – Daniel Robertson, American-born British architect and garden designer (died 1849)

• March 27 – José Ramírez de Arellano, Spanish baroque architect and sculptor (born 1705)
• John Bastard, English architect working in Blandford Forum (born c.1688)
• George Tully, English architect working in Bristol