The 3rd constituency of the Loir-et-Cher (French: Troisième circonscription de Loir-et-Cher) is a French legislative constituency in the Seine-Maritime département.

Like the other 576 French constituencies, it elects one MP using a two round electoral system.

The 3rd Constituency of the Loir-et-Cher covers the north west of the department including the medieval town of Vendôme on the Loir river.

The seat has consistently returned deputies from the centre right.

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