The year 1811 in architecture involved some significant events.

• Argyll House, London, designed by William Wilkins is completed
• The House wing of the United States Capitol, designed by William Thornton and Benjamin Latrobe is completed.

• March – The Commissioners' Plan of 1811 determines the grid plan of Manhattan.
• John Nash prepares his plan of the Regent Street and Regent's Park areas of London.

• Grand Prix de Rome, architecture: Jean-Louis Provost.

• c. May – Thomas Larkins Walker, British architect (died 1860)
• July 13 – George Gilbert Scott, English architect (died 1878)^[1]

• May 5 – Robert Mylne, British architect (born 1734)
• August 22 – Juan de Villanueva, Spanish architect (born 1739)