Old Kea (Cornish: Lanndege) is a hamlet in Cornwall, England, United Kingdom. It is situated on the west bank of the Truro River approximately two miles (3 km) south of Truro.
This and the nearby village of Kea are said to have been named after the Saint Kea who arrived at Old Kea from Ireland in the 5th century.
There is mention in the Domesday Book of a monastery at this location. Only the tower remains of the original parish church which stood at Old Kea. A small mission chapel was built onto the church in 1863 and services are still held twice a month.
Old Kea lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park.