- French commune.name
- Saint-Martin-sur-Oust
- French commune.native name
- Sant-Varzhin-an-Oud
- French commune.commune status
- Commune
- French commune.image
- Château de Castellan.jpg
- French commune.caption
- The Château of Castellan
- French commune.image coat of arms
- Blason ville fr Saint-Martin-sur-Oust (Morbihan).svg
- French commune.INSEE
- 56229
- French commune.postal code
- 56200
- French commune.arrondissement
- Vannes
- French commune.canton
- Guer
- French commune.mayor
- Marion Le Pogam
- French commune.term
- 2020–2026
- French commune.elevation min m
- 2
- French commune.elevation max m
- 103
- French commune.area km2
- 28.24
