Uthina or Oudna (Arabic: أوذنة) was an ancient Roman-Berber city located near Tunis, Tunisia.

[1] Uthina became a Roman colony of veterans of Legio XIII Gemina during the reign of Emperor Augustus.

[4] From the accounts given by geographers the site seems to be the ruins that form the archeological site of Oudna, near a station on the railway from Tunis to Kef and not far from what was the World War II Oudna Airfield.

These ruins occupy a surface nearly three miles in circumference, covering a hilly plateau, and commanding the left bank of the Milian wady; there are remains of a fortress, cisterns, an aqueduct, a triumphal arch, a theatre, an amphitheater, a basilica with a circular crypt, and a bridge.

It is half dug into the hill and the seats were addorsed to the slope; only the upper part of the building with the arcs is above ground.