Waterford is a city located in County Waterford in the south-east of Ireland, within the province of Munster. It is situated at the head of Waterford Harbour and is known as the oldest city in Ireland. Waterford has historical significance as a Viking settlement and has notable medieval defensive structures. It is the fifth most populous city in the Republic of Ireland, with a population of about 60,079 as of 2022. The city is also known for its former glassmaking industry, including the famous Waterford Crystal factory.

County Waterford itself is a county in Ireland's southern province of Munster, bordered by the Atlantic Ocean to the south and neighboring counties such as Cork, Tipperary, Kilkenny, and Wexford. The county includes mountain ranges like the Knockmealdown and Comeragh Mountains and has a volcanic coastline with over 30 beaches.

There is also a small city named Waterford in Ontario, Canada, with a population of about 4,227 as of 2016, but the more notable and historic Waterford is in Ireland.