Maktar or Makthar (Arabic: مكثر), also known by other names during antiquity, is a town and archaeological site in Siliana Governorate, Tunisia.

In the 3rd century BC the Numidians built a strategic fortress at the site, chosen to control trade routes between Sbeitla, Kairouan, and El Kef.

Mactaris grew into one of the richest cities in the province as a transit point for grain, oil, livestock, and textiles between Carthage, Sufetula, Thugga, and Tebessa.

Maktar survived the Muslim invasions, but the devastating raid of the Beni Hilal in 1050 led to the complete destruction and abandonment of the site.

Although not fully excavated, the ruins unearthed so far, especially of the thermal baths and the Schola of the Juvenes, mark this as one of the most remarkable ancient sites in Tunisia.

Excavations by Mansour Ghaki of an intact burial chamber uncovered many ceramics of various origins, both local and imported, dating from the early third century BC.

The Tunisian government included the site in its proposal of 2012 to add various pre-Islamic monuments to the Unesco World Heritage List.

The walls of the frigidarium rise to 15 m. The building was constructed around the year 200 AD and is decorated with oriental foliage on the capitals and with a beautiful mosaic floor.

Built around the year 200, this building complex was the meeting place of the "youth organization" or Brotherhood, a kind of militia of young men, whose duties included policing and especially tax collection.

The Brotherhood became increasingly influential over time, as rich citizens of provincial cities used it to resist the authority of the central government.

In the Christian era the original building, called the Basilica, was used as a church, using a Punic sarcophagus from the adjacent necropolis as an altar.