1855 in architecture

Buildings completed

• The Palais de l'Industrie for the Exposition Universelle in Paris, France, mainly designed by the architect Jean-Marie-Victor Viel and the engineer Alexis Barrault.
• Église Saint-Eugène-Sainte-Cécile [fr] in Paris, designed by Louis-Auguste Boileau, is completed.
• Church of St John the Evangelist, Preston, Lancashire, England, designed by E. H. Shellard, is completed.
• The Old Stone Church (Cleveland, Ohio) in the United States, designed by Charles Heard and Simeon Porter.
• Church of Saint Bartholomew, Brugherio in Italy, rebuilt to the design of Giacomo Moraglia, is completed.
• St Mary's Cathedral, Killarney, Ireland (Roman Catholic), to the design of Augustus Pugin following his death, is consecrated.
• The Victoria Tower of the Palace of Westminster in London, England, as The King's Tower, designed by Charles Barry and Augustus Pugin.
• Neues Museum, Berlin, Prussia, designed by Friedrich August Stüler.
• The original Smithsonian Institution Building in Washington, D.C., to the 1846 design of James Renwick Jr.
• Fremantle Prison in Western Australia, opened.