The Priory of St. Cosmas (French: Prieuré de Saint-Cosme) or the Priory of Ronsard is a former priory built upon an island in the river Loire at La Riche near Tours in Touraine, founded in the 11th Century and dedicated to St. Cosmas. The site features a museum dedicated to the French poet Ronsard, who spent the last twenty years of his life among the Canons Regular there.