Lismore () is a historic town in County Waterford, in the province of Munster, Ireland. Originally associated with Saint Mochuda of Lismore, who founded Lismore Abbey in the 6th century, the town developed around the medieval Lismore Castle. As of the 21st century, Lismore supports a rural catchment area, and was designated as a "district service centre" in Waterford County Council's 2011–2017 development plan. As of 2022, the town had a population of 1,347 people.
thumb|upright|The [[Lismore Crozier, c. 1100]]
The Book of Lismore, a compilation of medieval Irish manuscripts mainly relating the lives of Irish saints, notably St Brigid, St Patrick, and St Columba, also contains , a Middle Irish narrative dating to the 12th century, pertaining to the Fenian Cycle. The Book of Lismore and the Lismore Crozier (an enclosure for an episcopal staff, believed to be the venerable oaken staff of the founder of the abbey), were discovered together in 1814 behind a blocked-up doorway in Lismore Castle. and the Lismore Crozier is in the National Museum of Ireland in Dublin.
The medieval Lismore Cathedral, dedicated to St Carthage, variously damaged and repaired over the centuries, is notable for its architecture and the stained glass window by the English pre-Raphaelite artist, Edward Burne-Jones. It has been a place of worship since the 7th century but the current cathedral was constructed in the 17th century. Lismore Courthouse was completed in 1815.
St Carthage's Church in the town is a Catholic church also dedicated to St Carthage, which has operated since it opened in 1884.
A plaque was erected in the town to commemorate the regular visits made to Lismore by Fred Astaire following an association developed by his sister, Adele Astaire, who was married to Lord Charles Cavendish, son of Victor Cavendish, 9th Duke of Devonshire. A notable resident born in the town who has described her early life in Lismore, is the travel writer and world touring cyclist Dervla Murphy. Another notable resident was George O'Brien, the Irish memoirist, writer, and academic, who was raised by his paternal grandmother in Lismore, described in his memoir The Village of Longing: An Irish Boyhood in the Fifties (1987).
In September 2003, Blackwater Community School opened as an amalgamation of three local schools: Lismore CBS, Presentation Convent, Lismore and St Anne's Secondary School, Cappoquin.
Location
Lismore is in the west of County Waterford, where the N72 road crosses the River Blackwater at the foot of the Knockmealdown Mountains (Irish: Sléibhte Chnoc Mhaoldomhnaigh), the mountain range which divides the counties of Tipperary and Waterford.
Dungarvan is 21 km to the east of Lismore, and Fermoy is 24 km to the west.