The year 1809 in architecture involved some significant architectural events and new buildings.

Events

• September – Demolition of most of the Anglo-Saxon St Mary's Church, Reculver, on the coast of south-east England, begins.^[1]

Buildings and structures

• Gordon House, Chelsea, London, England, designed by Thomas Leverton for Colonel James Willoughby Gordon.^[2]
• Nelson's Column, Montreal, Canada, designed and built by Coade & Sealy of London.^[3]
• Nelson's Pillar, Dublin, Ireland, design by William Wilkins amended by Francis Johnston, opened.
• Armagh Courthouse, Ireland, designed by William Wilkins, completed.
• Portsmouth Academy building, Portsmouth, New Hampshire, United States, designed by James Nutter.
• Second Theatre Royal, Covent Garden, London, designed by Robert Smirke, opened.
• Dunkeld Bridge, Scotland, designed by Thomas Telford, completed.^[4]

Awards

• Grand Prix de Rome, architecture: André Chatillon.

Births

• February 15 – Owen Jones, Welsh architect and designer (died 1874)^[5]
• March 29 – Georges-Eugène Haussmann, French town planner (died 1891)
• October 31 – Edmund Sharpe, English architect and architectural historian (died 1877)
• November 26 – Thomas Talbot Bury, English architect and lithographer (died 1877)

Deaths

• November 4 – Gabriel Manigault, American architect (born 1758)