Lewannick (/luˈɒnɪk/; Cornish: Lannwenek) is a civil parish and village in Cornwall, England, United Kingdom.

[3] The parish church is dedicated to St Martin and is located at grid reference SX 2759 8071.

Evidence of early medieval habitation at Lewannick is in the form of two inscribed pillar stones, each having text in both Latin and ogham characters; on the basis of the ogham text, these stones have been dated as having been inscribed between the fifth and sixth centuries.

One is located in the village churchyard, and was dedicated to a "Ingenuus"; the other has been moved inside to the church nave, and both texts mention an "Ulcagnus".

[4] Two miles south-west, in the valley of the River Lynher, are the fragmentary remains of the medieval Upton Castle.