The 4th constituency of the Sarthe is a French legislative constituency in the Sarthe département.

In the 2007 legislative election, the constituency was won by François Fillon.

Fillon was appointed Prime Minister, whereupon he automatically lost his seat; in France, a member of the executive cannot simultaneously be a member of the legislature.

On 20 July his deputy candidate, Marc Joulaud, who had previously held the seat himself, automatically took Fillon's place in the Assembly.

[1] * PS dissident without the support of the NUPES alliance [2]