Obba was an Ancient town in Roman North Africa. It is now a Latin Catholic titular see.
Obba was near Carthage, in modern Tunisia, and is placed in the Roman province of Africa Proconsularis by the Annuario Pontificio. Sophrone Pétridès is a lone voice in placing it in the split-off Roman province of Byzacena, further south.
According to the Catholic Encyclopaedia, it is the modern Ebba. (Abbah Quşūr?)
Pétridès says the town was situated on the highway from Carthage to Theveste (modern Tebessa), seven miles from Lares (now Lorbeus) and sixteen miles from Altiburus (Henshir Medina).
Werner Huß sees as the most likely location modern Henchir Bou Djaoua or Henchir Merkeb en-Nabi.
Polybius mentions the town, under the name of Abba, as the place Syphax retreated to in in the Second Punic War (218-201 BC) after Numidian king Masinissa and the Romans burned his camp near Utica, and Livy mentions it as where Syphax linked up with a body of 4000 Celtiberian mercenaries raised by Carthage's Hasdrubal Barca.
A diocese was established there around 200 AD and of Africa and Christian bishopric, a suffragan of Carthage, the Metropolitan see of the North African ecclesiastical province, in the papal sway.