Chapelle de Saint-Martin-la-Vallée, Romanesque chapel in Semur-en-Brionnais, Saône-et-Loire, France

The chapel of Saint-Martin-la-Vallée is a Romanesque building erected between the late 11th and early 12th centuries. Its square bell tower, topped by a four-sided slate spire and a cross, stands south of the choir rather than over it, an arrangement also found at Saint-Maurice-lès-Châteauneuf and Saint-Martin-du-Lac. The single nave has an exposed timber roof and opens through a round-arched doorway into a choir with a semi-circular cul-de-four apse. Restoration from 1999 to 2014 revealed monumental wall paintings in the choir, including a Christ in Majesty surrounded by the tetramorph, executed in the 12th–13th centuries and again in the 16th century.

The chapel was built in the late 11th century and originally served as a church for the local community. By 1274, it ceased functioning as a parish church and became attached to the larger collegiate church in Semur-en-Brionnais.

The name refers to Saint Martin of Tours, to whom 192 parishes in Burgundy's four departments are dedicated. The chapel was the parish church of a parish that included the hamlets of Rochefort, La Fay, Les Cours, Vernay and la Cray, with a mill on the Grozélier stream and a fountain of mildly purgative water.

The chapel stands in the hamlet of Saint-Martin-la-Vallée, on high ground between the centre of Semur-en-Brionnais and the town of Marcigny; from the site you look across to the Saint-Hugues fortress and the Saint-Hilaire church. The Château de la Vallée, also in the hamlet, is private and cannot be visited. The building is inscribed as a monument historique by decree of 29 March 1971.

The bell tower stands south of the choir rather than above it, a layout also found at Saint-Maurice-les-Châteauneuf and Saint-Martin-du-Lac. An apsidiole was added east of the tower, and a small room there may have served as a chapel for the lords of Semur.