The Roman Theatre of Cartagena is an ancient Roman theatre built between the 5th and 1st centuries BCE. It is located in the Spanish city of Cartagena, in the region of Murcia, and was discovered in the 1980s during archaeological excavations in the city.

The theatre was built on the slopes of a hillside, and could seat up to 6,000 spectators. The theatre was used for performances and shows, including plays, poetry recitals, and gladiatorial contests.

After the fall of the Roman Empire, the theatre was abandoned and forgotten, and the hillside on which it was built was used for other purposes. Over time, the theatre was buried under layers of earth and rubble.

In the 19th and 20th centuries, the area was redeveloped, and several buildings were constructed over the site of the theatre. It wasn't until the 1980s that the ruins of the theatre were rediscovered during excavations, and it has since been restored and partially reconstructed.