Ouenza (Arabic: الونزة) is a town in Tébessa Province, in far eastern Algeria; near the border with Tunisia; 43 km south of Souk Ahras; and west of M'Daourouch.

Ethnologically, the city draws its population from the diverse surrounding regions, including Souk Ahras, Taoura, Annaba, Guelma, Tebessa, Chréa, El-meridj, Ain Zerga, Meskiana and others.

Ouenza was built by the French Société de l'Ouenza at the start of the Twentieth Century, to exploit the iron ore deposits that have been the basis of economic growth in the region for over 100 years.

But once these workers retired and returned home with their families, they were replaced by inhabitants of Ouenza's neighbouring villages.

The majority of the inhabitants leave for coastal towns such as Annaba and el Kala during the summer season.