Wallace K. Harrison (1895 Worcester, Massachusetts - 1981 New York City), American twentieth-century architect.

Harrison started his professional career with the firm of Corbett, Harrison & MacMurray participating in the construction of Rockefeller Center, and Harrison is best known for executing large public projects in New York City and upstate, many of them a result of his long and fruitful personal relationship with Nelson Rockefeller. Architecturally, Harrison's major projects are marked by straightforward planning and sensible functionalism, although his residential side-projects show more experimental and humane flair. His architectural partner from 1941 to 1976 was Max Abramovitz.

In 1931 Harrison established an 11 acre (45,000 m²) summer retreat in West Hills, New York, which was a very early example and workshop for the International Style in the United States, and a social and intellectual center of architecture, art, and politics. Frequent visitors and guests included Nelson Rockefeller, Robert Moses, Marc Chagall, LeCorbusier , and Ferdinand Leger , who waited out part of World War II by painting a mural at the bottom of the swimming pool.

Harrison's projects include:

• the landmark Perisphere and Trylon for the New York 1939 World's Fair
• LaGuardia Airport
• master plan for Lincoln Center for the Performing Arts (coordinating the work of Pietro Belluschi, Gordon Bunshaft, Philip Johnson, and Eero Saarinen, among others
• the Metropolitan Opera House at Lincoln Center
• the Time-Life Building, New York City
• the Exxon Building, New York City
• lead architect for the United Nations headquarters complex, coordinating the work of an international cadre of designers including Sven Markelius , LeCorbusier , and Oscar Niemeyer, among others
• the New York Hall of Science at the 1964 World's Fair
• the Battery Park City complex, New York City
• Empire State Plaza in Albany, New York