The Rock of Cashel , also known as Cashel of the Kings and St. Patrick's Rock, is a historic site in Ireland, located at Cashel, County Tipperary. The Rock of Cashel is really composed of four different structures which are the Hall of the Vicars Choral, the cathedral, the round tower, and Cormac's Chapel. Hore Abbey is about one kilometer north at the base of the rock.

The Rock of Cashel served as the traditional seat of the Kings of Munster for several hundred years prior to the Norman invasion which began in 1167, though few remnants if any of the early structures survive. The majority of buildings on the current site date from the 12th and 13th centuries. Cashel is reputed to be the site of the conversion of the King of Munster by St. Patrick in the 5th century A.D. The buildings which crown the Rock of Cashel present a mass and outline of great complexity, rivalling other sites in western Europe.

The complex has a character of its own, unique and native, and is one of the most remarkable collections of Celtic art and medieval architecture to be found anywhere in Europe. According to local lore, the Rock of Cashel originated from Devil's Bit a mountain in County Tipperary, a mountain 30 km north of Cashel when St. Patrick banished Satan from a cave, resulting in the Rock to land in Cashe

Note: A Cashel is a type of small ring-fort in Ireland, typically built on a rocky outcrop.