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.
- 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.
- Grand Prix de Rome, architecture: François-Narcisse Pagot.
- April 3 – David Bryce, Scottish architect (died 1876)
- April 20 – Christian Hansen, Danish historicist architect (died 1883)
- August 3 – Joseph Paxton, English gardener, architect and MP (died 1865)
- 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)
- Rivington Unitarian Chapel. Archived 2010-09-27 at the Wayback Machine
- This article incorporates text from a publication now in the public domain: Burnet, George Wardlaw (1886). "Bryce, David". In Stephen, Leslie (ed.). Dictionary of National Biography. 7. London: Smith, Elder & Co. p. 158.
- Colquhoun, Kate (2003). A Thing in Disguise: The Visionary Life of Joseph Paxton. Fourth Estate. ISBN 0-00-714353-2.
- Herrmann, Wolfgang (1984). Gottfried Semper: In Search of Architecture. Cambridge, Massachusetts; London. ISBN 0-262-08144-X.