Nenagh is the county town of North Tipperary in Ireland. It is a civil parish in the historical barony of Ormond Lower. It is also an Ecclesiastical parish in the Roman Catholic Diocese of Killaloe. Nenagh was originally a market town, and its name in Irish means "The Fair of Ormond" - a reference to the Ormond (East Munster) Fair, of which it was the site. Nenagh is today a busy commercial town and is governed by Nenagh Town Council.
Nenagh, the largest town in North Tipperary, lies to the west of the Nenagh River, which empties into Lough Derg at Dromineer, 9 km to the north-west, a popular centre for sailing and other water sports. The Silvermine Mountain range lies to the south of the town, with the highest peak being Keeper Hill (Irish: Sliabh Ciamalta) at 694 m. The Silvermines have been intermittently mined for silver and base metals for over seven hundred years. Traces of 19th century mine workings remain.