Couture-sur-Loir (French pronunciation: [kutyʁ syʁ lwaʁ], literally Couture on Loir) is a former commune in the Loir-et-Cher department of central France.

The main industry (apart from farming and tourism) is gravel extraction; excavated areas have been adapted for water sports.

A partial source for the history of Couture in the later 17th century are the memoirs of Louis XIV's valet, Marie Dubois, who came from the village.

Renowned for the Renaissance chateau of La Possonnière, birthplace of the poet Pierre de Ronsard,[3] the village also possesses an Angevin-style church dedicated to Saints Gervase and Protase.

Notable 20th-century inhabitants have included the Hallopeau and Sainte-Claire Deville families (noted scientists), the academic inspector Jean Pasquier and the Catholic historian François Lebrun.