The year 1798 in architecture involved some significant events.

Buildings and structures

Buildings

• September 2 – Opening of the Teatro Comunale (Ferrara) in Italy,^[1] designed by Cosimo Morelli and Antonio Foschini.
• Building of the first major example of Egyptian Revival architecture, Karlsruhe Synagogue in Baden, designed by Friedrich Weinbrenner.
• Completion of the neoclassical summer retreat at Castle Coole in Northern Ireland, designed by James Wyatt.
• Completion of the theatre and summer retreat at Ostankino Palace near Moscow.
• Completion of the Massachusetts State House in Boston, designed by Charles Bulfinch.
• Completion of the Royal Chapel of St. Anthony of La Florida in Madrid, designed by Felipe Fontana.
• Completion of the İzzet Mehmet Pasha Mosque in Safranbolu, Turkey.
• Completion of first São João National Theatre in Porto, Portugal as an opera house, designed by Vicente Mazzoneschi.
• Opening of the Teatro della Concordia in Iesi, Ancona.
• Building of Bewdley Bridge over the River Severn in England, designed by Thomas Telford.
• Opening of the skew Store Street Aqueduct on the Ashton Canal in Manchester, designed by Benjamin Outram.
• Completion of remodelling of Romney's House, Hampstead, London, to incorporate a studio and gallery, designed by Samuel Bunce.

Births

• May 8 – Joseph Welland, Irish architect (died 1860)^[2]
• June 27 – Joseph John Scoles, English Catholic architect (died 1863)^[3]
• October 14 – Félix Duban, French architect (died 1870)^[4]

Deaths

• June 25 – Thomas Sandby, English watercolour artist and architect (born 1721)
• November 2 – Charles de Wailly, French architect (born 1730)
• December 10 – Laurynas Gucevičius, Lithuanian architect (born 1753)