1803 in architecture

The year 1803 in architecture involved some significant architectural events and new buildings.

Buildings and structures

The Raj Bhavan in Kolkata, West Bengal, India.
Holy Cross Church, Boston, Massachusetts, designed by Charles Bulfinch, dedicated.
St. John's Chapel (New York City), designed by John McComb, Jr. and his brother Isaac.
Rivington Unitarian Chapel in Lancashire, England.[http://www.unitarian.org.uk/mda/RIVINGTON/ Rivington Unitarian Chapel.] {{webarchive|url=https://web.archive.org/web/20100927065749/http://www.unitarian.org.uk/mda/RIVINGTON/ |date=2010-09-27 }}
Bob Church, Cluj, Transylvania.
Casa del Labrador, designed by Isidro González Velásquez, at the Royal Palace of Aranjuez in Spain is completed.
Nantwich Bridge in Cheshire, England, built by William Lightfoot.

April 3 – David Bryce, Scottish architect (died 1876){{DNB|wstitle=Bryce, David |first=George Wardlaw|last=Burnet|volume=7|page=158}}
April 20 – Christian Hansen, Danish historicist architect (died 1883)
August 3 – Joseph Paxton, English gardener, architect and MP (died 1865){{cite book|first=Kate|last=Colquhoun|title=A Thing in Disguise: The Visionary Life of Joseph Paxton|publisher=Fourth Estate|year=2003|isbn=0-00-714353-2}}
October 16 – Robert Stephenson, English railway civil and mechanical engineer (died 1859)
November 29 – Gottfried Semper, German architect, art critic and professor of architecture (died 1879){{cite book|last=Herrmann |first=Wolfgang|title=Gottfried Semper: In Search of Architecture|url=https://archive.org/details/gottfriedsemperi0000herr |url-access=registration |location=Cambridge, Massachusetts; London|year=1984|isbn=0-262-08144-X}}