A borough is an administrative division in various countries. In principle, the term borough designates a self-governing walled town, although in practice, official use of the term varies widely.

The word borough derives from common Germanic *Burg, meaning fort: compare with bury, burgh and brough (England), burgh (Scotland), Burg (Germany), borg (Scandinavia), burcht (Dutch), boarch (West Frisian), and the Germanic borrowing present in neighbouring Indo-european languages such as borgo (Italian), bourg (French), burgo (Spanish and Portuguese), burg (Romanian), purg (Kajkavian) and durg (दर्ग) (Hindi) and arg (ارگ) (Persian). The incidence of these words as suffixes to place names (for example, Aldeburgh, Bamburgh, Tilbury, Tilburg, Strasbourg (Strossburi in the local dialect), Luxembourg, Edinburgh, Grundisburgh, Hamburg, Gothenburg) usually indicates that they were once fortified settlements.