Abthugni (Punic: 𐤀𐤐𐤁𐤂𐤍, ʾPBGN, or 𐤀𐤐𐤕𐤁𐤂𐤍, ʾPTBGN)[1] was an ancient city in Roman North Africa[2] at present day Suwar (Henchir-es-Souar) in Tunisia.

In late antiquity Abthugni was also the seat of a bishop, and the diocese is a titular see of the Roman Catholic Church to this day.

The city was located at Henchir-es-Souar in the hill country south of Uthica, 25 kilometres (16 mi) from Zaghouan at an elevation of 200 feet (61 m) above sea level.

Ernest Babelon lists many preserved buildings, including two temples, the Byzantine city wall, a rectangular basin, and a mausoleum.

[17] The proto-Donatist in Cirta called his consecration invalid,[18][19] The diocese ceased to function effectively in the late 7th century with the coming of Islamic armies.