Rotaria (adjective Rotariensis) was an ancient Roman and Byzantine era bishopric of Numidia, North Africa.

The civitas turned predominantly Donatist (a schismatic heresy) in Churchmanship. and appears to have been ethnically Roman rather than Berber. It is a titular see and the title is now held by Ivan Šaško, auxiliary bishop of Zagreb.

Rotaria has been identified with Henchir-Loulou, near Renier Algeria, but was located in the Roman province of Numidia.

Nearby Azura, Numidia, also was a civitas and bishopric, and similarly now a Latin Catholic titular see.