The Twenty-five Year Award is an architecture prize awarded each year by the American Institute of Architects (AIA) to "a building that has set a precedent for the last 25 to 35 years and continues to set standards of excellence for its architectural design and significance" and which was designed by an architect licensed in the United States. The Twenty-five Year Award was first presented in 1969, and has been handed out every year from 1971 onward, with the exception of 2018. In 2023, the prize was awarded to the Guggenheim Museum Bilbao in Bilbao, Spain by Gehry Partners.

Five buildings in New York City have received the award, the most of any city. Washington, D.C., is second with three, while Boston, Chicago, Los Angeles, and New Haven each have two. Only six buildings outside of the United States have received the award: two in London, England, and one each in Jeddah, Saudi Arabia; Barcelona, Spain; Bilbao, Spain; and Paris, France.

Finnish American architect Eero Saarinen designed or contributed to six buildings so honored, tied with the architectural firm of Skidmore, Owings & Merrill. Louis I. Kahn and Frank Lloyd Wright each have five buildings that have been honored that were designed or contributed to by them; Frank Lloyd Wright has 4, and there are three apiece by Ludwig Mies van der Rohe and the firm Pei Cobb Freed & Partners. Of the 53 projects that received this award through 2022, only three had women as contributing architects: the Eames House, the Vietnam Veterans Memorial, and the Sainsbury Wing at the National Gallery.

The Twenty-five Year Award can be awarded to any type of architectural project and may be either a single structure or a group of structures that compose a larger whole. Winners have included monuments, such as the Gateway Arch and Vietnam Veterans Memorial, and groupings of buildings, such as the Salk Institute for Biological Studies and Haystack Mountain School of Crafts. Most buildings nominated for this award are new structures but one winner, Faneuil Hall Marketplace, was a substantial renovation of warehouses into a festival marketplace.

For a project to be eligible to win the Twenty-five Year Award, it must have been built between 25 and 35 years before the year of the award. It must also have been designed by "an architect licensed in the United States at the time of the project’s completion". This means that the award candidate can be anywhere in the world, but must have been designed by a licensed American architect, such as the Fundació Joan Miró in Spain.

To be nominated the project must be in a "substantially completed form" as well as "in good condition". Potential candidates must not have been altered substantially since they were built. Change of use is allowed by the rules, but the "original intent" of the structure must still be intact. These changes of use include reorganization of interior space. This was taken into account with the Price Tower, which when built was a mix of offices and apartments, but when awarded, had only one apartment remaining. The award is presented at the AIA National Convention each year.

"Any AIA member, group of members, component, or Knowledge Community" is allowed to nominate a project for the Twenty-five Year Award. A project may be nominated multiple times, as long as it still complies with the eligibility requirements. Nominees are judged by today's architectural standards in their function, execution, and creativity. The project and its site are judged together, with any changes in context taken into account.

The "Year" column, which indicates when the building won the award, links to an article about the year's significant architectural events.

Year	Building(s) city	Image	Architect(s)
1969	Rockefeller Center New York City		Reinhard & Hofmeister; Corbett, Harrison & MacMurray
1971	Crow Island School Winnetka, Illinois		Perkins, Wheeler & Will; Eliel & Eero Saarinen
1972	Baldwin Hills Village Los Angeles		Reginald D. Johnson; Wilson, Merrill & Alexander; Clarence S. Stein
1973	Taliesin West Paradise Valley, Arizona		Frank Lloyd Wright
1974	Johnson and Son Administration Building Racine, Wisconsin		Frank Lloyd Wright
1975	Philip Johnson's Residence ("The Glass House") New Canaan, Connecticut		Philip Johnson
1976	860–880 North Lakeshore Drive Apartments Chicago		Ludwig Mies van der Rohe
1977	Christ Lutheran Church Minneapolis		Saarinen, Saarinen & Associates; Hills, Gilbertson & Hays
1978	Eames House Pacific Palisades, California		Charles and Ray Eames
1979	Yale University Art Gallery New Haven, Connecticut		Louis I. Kahn
1980	Lever House New York City		Skidmore, Owings & Merrill
1981	Farnsworth House Plano, Illinois		Ludwig Mies van der Rohe
1982	Equitable Savings and Loan Building Portland, Oregon		Pietro Belluschi
1983	Price Tower Bartlesville, Oklahoma		Frank Lloyd Wright
1984	Seagram Building New York City		Ludwig Mies van der Rohe
1985	General Motors Technical Center Warren, Michigan		Eero Saarinen and Associates with Smith, Hinchman & Grylls
1986	Solomon R. Guggenheim Museum New York City		Frank Lloyd Wright
1987	Bavinger House Norman, Oklahoma		Bruce Goff
1988	Washington Dulles International Airport Terminal Building Chantilly, Virginia		Eero Saarinen and Associates
1989	Vanna Venturi House Chestnut Hill, Pennsylvania		Robert Venturi
1990	Gateway Arch St. Louis		Eero Saarinen and Associates
1991	Sea Ranch Condominium One The Sea Ranch, California		Moore Lyndon Turnbull Whitaker
1992	Salk Institute for Biological Studies La Jolla, California		Louis I. Kahn
1993	Deere & Company Administrative Center Moline, Illinois		Eero Saarinen and Associates
1994	Haystack Mountain School of Crafts Deer Isle, Maine	—	Edward Larrabee Barnes
1995	Ford Foundation Headquarters New York City		Kevin Roche, John Dinkeloo and Associates
1996	United States Air Force Academy Cadet Chapel Colorado Springs		Skidmore, Owings & Merrill
1997	Phillips Exeter Academy Library Exeter, New Hampshire		Louis I. Kahn
1998	Kimbell Art Museum Fort Worth		Louis I. Kahn
1999	John Hancock Center Chicago		Skidmore, Owings & Merrill
2000	The Smith House Darien, Connecticut	—	Richard Meier & Partners
2001	Weyerhaeuser Headquarters Federal Way, Washington		Skidmore, Owings & Merrill LLP, Fazlur Rahman Khan
2002	Fundació Joan Miró Barcelona, Spain		Sert Jackson and Associates
2003	Design Research Headquarters Building Cambridge, Massachusetts		BTA Architects (formerly known as Benjamin Thompson & Associates, Inc.)
2004	East Building, National Gallery of Art Washington, D.C.		I.M. Pei & Partners, Architects
2005	Yale Center for British Art New Haven, Connecticut		Louis I. Kahn
2006	Thorncrown Chapel Eureka Springs, Arkansas		E. Fay Jones
2007	Vietnam Veterans Memorial Washington, D.C.		Maya Lin, designer; Cooper-Lecky Architects, architect of record
2008	The Atheneum New Harmony, Indiana		Richard Meier & Partners
2009	Faneuil Hall Marketplace Boston		Benjamin Thompson & Associates
2010	The Hajj Terminal at King Abdulaziz International Airport Jeddah, Saudi Arabia		Skidmore, Owings & Merrill LLP
2011	John Hancock Tower Boston		I.M. Pei & Partners
2012	Gehry Residence Santa Monica		Gehry Partners LLP
2013	Menil Collection Houston		Renzo Piano Building Workshop LLP
2014	Washington Metro Washington, D.C.		Harry Weese
2015	Broadgate Exchange House London		Skidmore, Owings & Merrill LLP
2016	Monterey Bay Aquarium Monterey, California		EHDD
2017	Grand Louvre – Phase 1 Paris		Pei Cobb Freed & Partners
2018	No award
2019	Sainsbury Wing at the National Gallery London		Venturi, Scott Brown and Associates
2020	Conjunctive Points-The New City Culver City, California		Eric Owen Moss Architects
2021	Burton Barr Central Library Phoenix		Will Bruder
2022	Chapel of St. Ignatius Seattle		Steven Holl Architects
2023	Guggenheim Museum Bilbao Bilbao, Spain		Gehry Partners

• Stirling Prize

General

"Twenty Five Year Award Recipients". American Institute of Architects. Retrieved July 3, 2013.

Specific

• Official website