Locronan (French pronunciation: [lɔkʁɔnɑ̃]; Breton: Lokorn) is a commune in the Finistère department of Brittany in north-western France.

Saint Ronan, greatly venerated in Brittany, was a 6th-century Irish Christian missionary who came to the region to teach the people.

Its hemp was exported internationally, as it was used for rigging the ships, both commercial and military, that operated from Brittany's many ports.

The municipality launched a plan through Ya d'ar brezhoneg on 23 November 2007 to revive the Breton language.

Held every six years between the second and third Sundays in July, the Grande Troménie is a pilgrimage of about 12 km, traversing the wider sacred area around Locronan.