The Theme Building is a structure at Los Angeles International Airport (LAX), considered an architectural example of the Space Age design style. Influenced by "Populuxe" architecture, it is an example of the Mid-century modern design movement later to become known as "Googie". The Airport Theme Building Exterior and Interior was designated as a historic-cultural monument in 1993 by the city.

William Leonard Pereira was an American architect from Chicago, Illinois, who was noted for his futuristic designs of landmark buildings such as the Transamerica Pyramid in San Francisco. Remarkably prolific, he worked out of Los Angeles, and was known for his love of science fiction and expensive cars, but mostly for his unmistakable style of architecture, which helped define the look of mid-20th century America.