1781 in architecture

The year 1781 in architecture involved some significant architectural events and new buildings.

Buildings

 * Brizlee Tower, Alnwick, Northumberland, England, a folly erected for Hugh Percy, 1st Duke of Northumberland, possibly designed by Robert Adam
 * St. Hilarius Parish Church of Näfels, Switzerland, designed by architects Johann Singer and Jakob Singer.
 * Triumphal Arc, Kamianets-Podilskyi, Ukraine, built for the visit of Polish King Stanisław August Poniatowski to the city of Kamianets-Podilskyi.
 * Sturehov Manor near Stockholm, designed by Carl Fredrik Adelcrantz, probably completed.
 * Montagu House, Portman Square, London, designed by James Stuart, completed.

Awards

 * Grand Prix de Rome, architecture: Louis Combes.

Births

 * March 13 – Karl Friedrich Schinkel, Prussian architect, city planner, and painter (died 1841)
 * August 12 – Robert Mills, possibly the first native-born American to train as a professional architect (died 1855)

Deaths

 * date unknown – Pietro Camporese the Elder, Italian architect (born 1726)