The 3rd constituency of Marne (French: Troisième circonscription de la Marne) is one of five electoral districts in the department of the same name, each of which returns one deputy to the French National Assembly in elections using the two-round system, with a run-off if no candidate receives more than 50% of the vote in the first round.

The constituency is made up of the six former cantons of Beine-Nauroy, Bourgogne, Reims-4, Reims-8, Reims-10, and Suippes.

[1] It covers most of the western edge of the department, plus an area to the south of Reims.

Despite the above-mentioned boundary changes, the area has remained consistently conservative in its voting habits, returning Philippe-Armand Martin (who had previously represented the 6th constituency) at the 2012 election.

Martin did not run in the 2017 election and the seat was won by Éric Girardin of La République En Marche!.