Crom Cruach (Old Irish Cromm Crúaich /ˈkɾˠɔmˠ ˈkɾˠuəç/) was a god of pre-Christian Ireland. According to Christian writers, he was propitiated with human sacrifice and his worship was ended by Saint Patrick.
He is also referred to as Crom Cróich, Cenn Cruach/Cróich (/ˈkʲɛnˠː ˈkɾˠuəx/) and Cenncroithi (/ˈkʲɛnˠː ˈkɾˠɔθʲɨ/). He is related to the later mythological and folkloric figure Crom Dubh. The festival for Crom Cruach is called Domhnach Crom Dubh, Crom Dubh Sunday.
The references in the dinsenchas ("place-lore") poem in the 12th century to sacrifice in exchange for milk and grain suggest that Crom had a function as fertility god. The description of his image as a gold figure surrounded by twelve stone or bronze figures has been interpreted by some as representing the sun surrounded by the signs of the zodiac, suggesting a function as solar deity.
Crom Cruach's name takes several forms and can be interpreted in several ways. Crom (or cromm) can mean "bent, crooked, stooped". Cenn can mean "head" or "the head, chief". Cruach (or crúach) can be an adjective, "bloody, gory", or a noun, meaning variously "slaughter", "stack of corn", or "pile, heap, mound". Plausible meanings include "bloody crooked one", "crooked stack of corn", "crooked one of the mound", "bloody head", "head of the stack of corn" or "head of the mound".
A decorated stone known as the Killycluggin Stone (from Irish: Coill an Chlogáin meaning 'the Wood of the Bell-Shaped Stone') has been interpreted by some as the cult image of Crom Cruach. It was found at Killycluggin, County Cavan. It was discovered broken in several pieces and partly buried close to a Bronze Age stone circle, inside which it probably once stood.
The 14th century Book of McGovern, written in Magh Slécht, contains a poem which states that Crom was situated at Kilnavert beside the road and that the local women used to tremble in fear as they passed by. There is still a local tradition in the area that the Killycluggin Stone is the Crom stone.
There is another standing stone identified with Crom Crúaich in Drumcoo townland, County Fermanagh. It has the figure of a man walking engraved on it, which either represents Saint Patrick or a druid, depending on when it was engraved. A nearby street is named Crom Crúaich Way after it.