Motor Square Garden, also known as East Liberty Market, is a building in Pittsburgh, Pennsylvania, United States, that is listed on the National Register of Historic Places.

Located at 5900 Baum Boulevard in the East Liberty neighborhood, it today serves as the headquarters of the Pittsburgh branch of the American Automobile Association, which owns the property.

Financed by the Mellon family of Pittsburgh, the building was built from 1898 to 1900 as a city market—after one of their real estate subdivisions failed to sell enough houses—calling it East Liberty Market House.

Motor Square Garden soon failed as a retail space, but in 1915 the new Pittsburgh Automobile Association bought it as a site for its auto shows.

The retail mall failed, but AAA expanded to occupy the building, along with a tenant, the UPMC Shadyside School of Nursing.