St Mabyn (Cornish: S. Mabon[2]) is a civil parish and village in Cornwall, England, United Kingdom.

Village amenities include a community shop and post office, a public house ‘St Mabyn Inn’ a village hall, a primary school, St Mabyn Church of England Primary School, a pre-school, a scout group, a garden club, and a Young Farmers' group.

In the 1980s private housing schemes at Mabena Close and Meadow Court were completed and there was further ribbon development growth along Station Road.

A residential development Greenwix Parc, comprising thirty five dwellings including 12 affordable units was completed by Midas Homes in 2011.

[20] The earliest signs of habitation are at the Iron Age hill fort of Kelly Rounds or Castle Killibury.

[22] In January 2021 the Chapelfield site was subject to a second archaeological excavation which revealed finds including rotary querns, glass table ware and a large range of local and imported pottery.

In the Domesday book of 1086 this district was taxed under the jurisdiction of Treu-es-coit (translated as "town of the wood", now called Trevisquite).

Trevisquite had land for 12 ploughs, 25 households, a mill, 20 acres of woodland and 50 of pasture; its value was 25 shillings a year.

[33] A United Methodist Free Church chapel was built with funding from Richard Hambly Andrew of Tredinnick in 1820 during the incumbency of Leveson-Gower[34] but is now a private house.

St Mabyn's standing stone was broken up for gateposts in 1850 and the stump re-located to the crossroads at Longstone.

[36] In 2012 a parish councillor became the first in Cornwall to be disqualified from holding public office, and was banned for two years for bullying and showing disrespect to members.

[37][38] Cornish wrestling tournaments for prizes were held in the old bowling green, adjoining the Old Inn, in St Mabyn churchtown.