The year 1831 in architecture involved some significant events.

• The Bridge of Sighs, St John's College, Cambridge, England, designed by Henry Hutchinson, is completed.^[1]
• The Dugald Stewart Monument in Edinburgh, Scotland, designed by W. H. Playfair, is completed.
• The Burns Monument, Edinburgh, is designed by Thomas Hamilton.
• North Church in Aberdeen, Scotland, designed by John Smith, is opened.
• Goodrich Court in Herefordshire, England, designed by Edward Blore, is completed.
• The Pedrocchi Café in Padua, Italy is completed.
• Waterloo Chamber at Windsor Castle in England, designed by Jeffry Wyatville, is constructed.

• Augustus Charles Pugin publishes Examples of Gothic Architecture in London.

• Grand Prix de Rome, architecture: Prosper Morey.

• January 12 – Philip Webb, English architect (died 1915)
• May 7 – Richard Norman Shaw, Scottish-born architect (died 1912)
• June 21 – John Henry Chamberlain, English architect (died 1883)

• December 8 – James Hoban, Irish architect working in the United States (born 1762)