The Circus Maximus (Spanish: Circo romano) is a Roman hippodrome in Mérida, Spain. Used for chariot racing, it was modelled on the Circus Maximus in Rome and other circus buildings throughout the empire. Measuring more than 400 m in length and 30 m of width, it is one of the best preserved examples of the Roman circus.

The circus could house up to 30,000 spectators.

There is no consensus about the circus' dating, as it was built and used for several years before being officially dedicated. It seems to have been built sometime around 20 BC, being inaugurated 30 years later. It was located far outside the city walls, but close to the road that connected the city to Toledo and Córdoba.

After the fall of the Western Roman Empire, and the rise of Christianity in Spain, the circus saw more use than the other Roman structures of Mérida, since was racing was considered less sinful than spectacles performed in the theater and Amphitheater.

Mérida's circus remains very well preserved. As is true with the Circus Maximus in Rome, most circuses's structures have been destroyed over time as the area occupied by them was great and often in very flat land near their respective cities. The circus however has kept numerous structures, including the Porta Pompae ("main entrance"), the Porta Triumphalis ("triumph gate"), the spina (the longitudinal wall), the tribunal iudicium ("tribune of the judges").