The Provincial Forum of Tarraco was a monumental complex of great magnitude (18 hectares), consisting of two large arcaded squares that housed the main administrative, religious and cultural buildings of the city of Tarraco, capital of the Roman province Hispania Citerior Tarraconensis, in present-day Spain. It is one of the locations of the World Heritage Site "Archaeological Ensemble of Tarraco", specifically the one identified with the code 875-003 for the representation square and 875-002 for the cult enclosure.

Dating from the Roman period, it was built in 73 AD by order of the Emperor Vespasian. It remained in use until the mid-5th century, after which the buildings surrounding the square were occupied as private dwellings. From the 12th century onwards, the interior of the square was urbanised and a street layout was defined that has been maintained to the present day. This space corresponds to the network of streets that make up a large part of the medieval quarter of Tarragona.

The space consisted of a square dedicated to worship and another larger one for representation, plus the lower enclosure where the circus was located.

The place of worship presided over the seat of the council and was located in the highest part of the city, today occupied by the Cathedral, the Cathedral square and other buildings. It was an impressive square measuring 153 metres by 136 metres, surrounded by a 9-metre high perimeter wall that supported the roof of a colonnaded portico, some 11 metres wide, which encircled the entire square. Within the framework of this porticoed square was the great temple of Augustus, whose impressive proportions are known (the columns are about 13.5 m high), but not its exact location.

The representation square was located on a lower terrace than the worship area, connected to it by a large staircase, which coincides with the present-day stairs in front of the Cathedral. The square was 175 metres wide and 318 metres long, making it the largest square ever built by the Roman Empire. Three of the four sides of the square were delimited by a raised podium covered by a large porticoed space supported by a wall of pilasters.

Behind this portico was a long vault, of which several sections have survived, such as the so-called vaults of the Pallol or Praetorium, which probably supported an upper gallery. At the southern corners of this square are the towers of the Ancient Audience and the Praetorium, which functioned as a staircase that gave access from the lower level of the circus to the square and the upper gallery.