The year 1998 in architecture involved some significant architectural events and new buildings.
- 5 April - Akashi Kaikyō Bridge, the longest suspension bridges in the world by the length of central span (1998 - present), opened.
- 6 July - Hong Kong International in Hong Kong, designed by Norman Foster, opened.
- 15 October - Bellagio Hotel and Casino in Las Vegas, designed by Marnell Corrao Associates, opened.
- Kiasma Museum of Contemporary Art, Helsinki, Finland, by Steven Holl Architects, 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.
- Petrona Twin Towers in Kular Lumpur, Malaysia designed by César Pelli, completed; it becomes the tallest building in the British Commonwealth and tallest building in the world (until 2004).
- Alvar Aalto Medal – Steven Holl
- Architecture Firm Award – Centerbrook Architects and Planners
- 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
- Park Hill, Sheffield, 1961 flatted public housing in South Yorkshire, England, is Grade II* listed, making it the largest listed building in Europe.
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