Boreum was a city and diocese in Roman Libya. It is now a Roman Catholic titular see.
Its modern location is Tabibbi, in southern modern Libya.
Boreum was important enough in the Roman province of Libya Superior (Libya Pentapolitana; part of Cyrenaica) to become one of the suffragan sees in this province, which depended directly on the Patriarchate of Alexandria (in Egypt) without a proper Metropolitan, but faded like most bishoprics in Roman Africa.[1][2][3] Only one ancient bishop is known, the Arian bishop Senziano, mentioned in 325.
In 1933 the diocese was nominally restored as a Latin titular bishopric of Boreum (Latin) / Borien(sis) (Latin adjective) / Boreo (Curiate Italian).[4][5]
It is vacant, having had only these incumbents, all of the fitting Episcopal (lowest) rank:[6]