Thignica was a town in the Roman province of Africa Proconsularis. It served as a Latin Catholic titular see.

Thignica's stone ruins are called Aïn Tounga, located southwest of Testour, Tunisia. They are very extensive and cover the summit and slopes of a series of hills. One inscription calls the town "Civitas Thignicensis" (the city of Thignica) and states that it was divided into three parts, another that it became a municipium at the beginning of the 3rd century under the name of "municipium Septimium Aurelium Antoninianum Herculeum Frugiferum Thignica". Towards the centre of the ruins is a Byzantine fortress, trapezoidal in shape, flanked by five square towers. Here an inscription makes mention of the proconsul Domitius Zenophilus (326-32), famous in the annals of Christian Africa. Among the other ruins are a small triumphal arch, a temple, a Christian church, the remains of the enclosure, etc.,^[1] as well as an amphitheatre.

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  Byzantine fortress
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  Aïn Tounga
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  Roman thermae
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  Roman-era temple
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  Roman theater
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  Street in Aïn Tounga

Despite the splendour and importance of this town we know only one bishop, Aufidius, who assisted at the Conference of Carthage (411), where he had a Donatist rival.^[1]