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St. Carthage Cathedral, Lismore is a Church of Ireland cathedral in Lismore, County Waterford.
The medieval cathedral was in ruins after a fire in the 17th century. The choir was reroofed by Richard Boyle, 1st Earl of Cork. The Cathedral was again destroyed in 1630, and rebuilt starting in 1663 with input from architect William Robinson. It was re-roofed and refurbished in the 18th century. All the various rebuilding and reconstruction works have involved input from such architects as Sir William Robinson, Sir Richard Morrison, and George and James Pain.

Lismore is a historic town in County Waterford. It is located by the River Blackwater at the foot of the Knockmeal Mountains.
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