The year 1998 in architecture involved some significant architectural events and new buildings.
- 5 April – Akashi Kaikyō Bridge, Japan, the longest suspension bridge in the world by the length of central span (1998-present), designed by Satoshi Kashima, opened.
- 16 April – City of Arts and Sciences, Valencia, Spain, designed by Santiago Calatrava and Félix Candela, inaugurated.
- 31 May – Saint Paul's Cathedral, Wellington, New Zealand, opened.
- June – Jean-Marie Tjibaou Cultural Centre, New Caledonia, designed by Renzo Piano, opened.
- 6 July – Chek Lap Kok Airport in Hong Kong, designed by Norman Foster, opened.
- 15 October – Bellagio Hotel and Casino in Las Vegas, designed by Marnell Corrao Associates, opened.
- November – River and Rowing Museum, Henley-on-Thames, England, designed by David Chipperfield.
- Kiasma Museum of Contemporary Art, Helsinki, Finland, by Steven Holl Architects, opened.
- Gemäldegalerie, Berlin, Germany (in the Kulturforum), designed by Heinz Hilmer and Christoph Sattler, opened.
- Waterside (building) at Harmondsworth, England, international headquarters of the airline British Airways, designed by Niels Torp, opened.
- Lucerne Culture and Congress Centre in Switzerland, designed by Jean Nouvel, opened.
- Jin Mao Building in Shanghai, designed by Skidmore, Owings & Merrill, completed.
- Petronas Towers in Kuala Lumpur, designed by César Pelli, completed; it becomes the tallest building in the British Commonwealth and tallest building in the world (until 2004).
- B 018 nightclub in Beirut, designed by Bernard Khoury.
- Polaria and the Polar Environment Centre in Tromsø, Norway
- Malator (earth house) in Wales, designed by Future Systems.
- 22 May–30 September – Expo '98 held in Lisbon, Portugal. It includes the Pavilion of Portugal designed by Álvaro Siza Vieira.
- 22 December – Park Hill, Sheffield, 1961 flatted public housing in South Yorkshire, England, is Grade II* listed, making it the largest listed building in Europe.
- Alvar Aalto Medal – Steven Holl
- Architecture Firm Award – Centerbrook Architects & Planners
- Carlsberg Architectural Prize – Peter Zumthor
- European Union Prize for Contemporary Architecture (Mies van der Rohe Prize) – Peter Zumthor for Kunsthaus Bregenz
- Grand Prix de l'urbanisme – Christian Devillers
- Grand prix national de l'architecture – Jacques Hondelatte
- Praemium Imperiale Architecture Laureate – Álvaro Siza
- Pritzker Prize – Renzo Piano
- Prix de l'Équerre d'Argent – Rem Koolhaas
- RAIA Gold Medal – Gabriel Poole
- Royal Gold Medal – Oscar Niemeyer
- Stirling Prize – Norman Foster and Partners, American Air Museum, Imperial War Museum, Duxford
- Thomas Jefferson Medal in Architecture – Jaquelin T. Robertson.
- Twenty-five Year Award – Kimbell Art Museum
- 6 January – Francis Skinner, British architect (born 1908)
- 13 June – Lúcio Costa, Brazilian architect and urban planner (born 1902)
- 29 August – Erik Asmussen, Danish-born architect (born 1913)
- 31 October – Rosemary Stjernstedt, British architect (born 1912)
- 14 November – Albert Frey, Californian "desert modernist" architect (born 1903)
- "Saint Paul's Cathedral, Wellington". Archived from the original on 2 December 2012. Retrieved 29 December 2012.
- "Chek Lap Kok Airport". Cool Stuff. ConstructMyFuture.com. Archived from the original on 28 June 2013. Retrieved 16 November 2013.
- Polar Environment Centre and Polaria in The Architecture Guide for Northern Norway and Svalbard
- Gerald W. R. Ward -The Grove Encyclopedia of Materials and Techniques in Art 2008- Page 121 ".. and the burgeoning school of modern architecture in Latin America, most notably at the Ministry of Education and Health in Rio de Janeiro (now the Palácio da Cultura, 1937–43) by Lúcio Costa (1902–98) ..."