Souday (French pronunciation: [sudɛ]) is a former commune in the Loir-et-Cher department in central France.

At 165 metres altitude, the village of Souday is built on a chalk plateau which is overlain by a sandy flint clay supporting profitable mixed agriculture.

The earliest houses in the village are timber framed, followed by flint construction and later with locally made bricks.

Facilities in the village include a restaurant, petrol station and bar, a main dealer garage, unisex hairdresser, grocery shop/post office, bakers and butchers.

Outdoor activities include fishing, good walking on marked routes and cycling on quiet roads.