Lunay () is a commune in the Loir-et-Cher department of central France.
Lunay is located west of the city of Vendôme, in the northwest of the département and 180 km southwest of Paris. The river Loir flows along the east and south edges of the commune for 8 km.
Lunay is bordered by Thoré-la-Rochette, Mazangé, Fortan, Savigny-sur-Braye, Fontaine-les-Coteaux, Montoire-sur-le-Loir, Les Roches-l'ÃÂvêque, and Saint-Rimay.