The Merchandise Mart (or the Merch Mart, or the Mart) is a commercial building located in the downtown Loop, of Chicago, Illinois, United States. When it opened in 1930, it was the largest building in the world, with 4,000,000 square feet (372,000 m2) of floor space. The art deco landmark is located at the junction of the Chicago River's branches. The building is a leading retailing and wholesale destination, hosting 20,000 visitors and tenants per day as of the late 2000s.

Wholesale showrooms occupy 50% of the usable floor space, and the Sultan of Brunei once spent $1.6 million at the Mart to furnish his entire palace, claiming the location was the only place where the task could be completed in one week. Select showrooms are open only to wholesalers, with others accessible to the general public. Unlike stores with traditional shelf and rack displays, entire usable rooms are created, providing consumers an opportunity to compare form and function between applications and manufacturers. A portion of the stores offer items for purchase singly or as a collection, while others offer design services, preservation, renovation, or installation. In addition to being a resource for architects and decorators, the Mart also has featured award-winning designs as selected by the American Institute of Architects. Catering to suppliers, on-site firms specialize in providing professional services for market research projects. In 1931, Marshall Field and Company lost five million dollars, followed by eight million in 1932. The wholesale division was greatly reduced and Field's reduced its space in the Mart from four floors to one and half. The Mart continued to display the latest trends in home furnishings within the showrooms and trade shows. The company recovered late in the decade, but did not return to all previously occupied space. In 1942, L. L. Skaggs formed a partnership with three other men and named the partnership the Owners Service Company, hence Osco. The headquarters moved from Waterloo, Iowa, to the Merchandise Mart. A retail shopping area, named The Shops at the Mart, opened in 1991 and includes apparel shops, beauty services, bookstores and newsstands, financial services, telecommunication services, travel services, specialty food and wine stores, photo services, a dry cleaner, shoe shine stand, and a food court. A U.S. Post Office is located on the first floor and a FedEx location is on the second floor. The Apparel Center houses the 521-room Holiday Inn Chicago Mart Plaza River North hotel, the offices of the Chicago Sun-Times and the Chicago campus of the Illinois Institute of Art - Chicago, as well as the Chicago office of the Ogilvy & Mather advertising agency. GoHealth occupies 93,000 square feet (8,600 m2) on the 5th floor of Merchandise Mart, the Potbelly Sandwich Works' corporate offices are located in the tower. Motorola Mobility moved its headquarters to the Merchandise Mart in 2014.

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