Merchandise Mart is a station on the Chicago Transit Authority's 'L' system, located in the Near North Side neighborhood at 350 North Wells Street in Chicago, Illinois. The station is elevated above street level, on a steel structure. The turnstiles and customer assistant booth of the station are located on the second level of the Merchandise Mart itself. This is the main entrance to the station.

The Chicago "L" is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. Operated by the Chicago Transit Authority (CTA), it is the fourth-largest rapid transit system in the United States in terms of total route length, at 102.8 miles (165.4 km) long as of 2014, and the third-busiest rapid transit system in the United States. In 2016, the "L" had 1,492 rail cars, eight different routes, and 145 train stations. In 2023, the system had 117,447,000 rides, or about 373,800 per weekday in the fourth quarter of 2023.