Trajan's Market (Latin: Mercatus Traiani; Italian: Mercati di Traiano) is a large complex of ruins in the city of Rome, Italy, located on the Via dei Fori Imperiali, at the opposite end to the Colosseum.

[7] During the Middle Ages the complex was transformed by adding floor levels, still visible today, and defensive elements such as the Torre delle Milizie, the "militia tower" built in 1300.

The Museum of the Imperial Fora (Italian: Museo dei Fori Imperiali), which opened in 2007, houses a wealth of artifacts from all of ancient Rome's forums.

The giant exedra formed by the market structure was originally mirrored by a matching exedral boundary space on the south flank of Trajan's Forum.

The grand hall of the market is roofed by a concrete vault raised on piers, both covering and allowing air and light into the central space.