Loisin (French pronunciation: [lwazɛ̃]; Arpitan: Luèsin) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France.

In 1860 after the annexation from the Savoy, Loisin became part of the canton of Douvaine.

The commune is part of the communauté d'agglomération Thonon Agglomération.

[3] In 2008, the commune engaged a Sustainable Development policy with the creation of an agenda 21.

This Haute-Savoie geographical article is a stub.