The Diocese of Svač (Latin: Dioecesis Suacinensis, Serbian: Svačka biskupija) was a bishopric with see in the town of Svač (Latinized as Suacia), which is today the village lying to the east of Ulcinj in Montenegro that is called in Serbian Шас, in Croat Šas and in Albanian Shas.
The area was part of the late Roman province of Dalmatia Superior, and the Catholic Church, which includes the diocese in its list of Latin titular sees, accordingly treats it as a suffragan of the Metropolitan Archdiocese of Doclea.
The diocese of of Svač (Suacia in Italian, Šas in Croatian, Suacium in Latin) was established circa 1000.
The see of the Diocese of Svač was suppressed in 1530, when its canonical territory was incorporated into that of the Albanian then Diocese of Shkodrë, now the Metropolitan Archdiocese of Shkodër-Pult.
(all Roman Rite; probably incomplete, notably much of the first centuries)
The diocese was nominally restored in 1933 as titular bishopric of Suacia.
It has had the following incumbents, of the fitting episcopal (lowest) rank: