Caerhun (Welsh: Caerhûn) is a scattered rural community, and former civil parish, on the west bank of the River Conwy.

Surrounding the 14th-century parish church of St. Mary are the banks of the Roman fort of Canovium.

[4] The church and its churchyard occupy the north-east quarter of the original Roman site.

After the end of Roman rule in Britain, the fort was associated with King Rhun Hir of Gwynedd, hence the subsequent name.

[6] Arthur Tysilio Johnson, the "Perfidious Welshman", lived at Oakbank, Caerhun, and developed an important garden around the house and the Bulkeley Mill in the grounds which feature in a number of his works.