The 4th constituency of Marne (French: Quatrième circonscription de la Marne) is one of five electoral districts in the department of the same name.

Each electoral district 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.

Like the others in the department, the 4th constituency has leaned consistently towards the right politically, once again returning a conservative – Lise Magnier of Les Républicains – in the 2017 election.

However, shortly after the election Magnier joined Agir, a moderate-right party supporting Emmanuel Macron's centrist parliamentary majority.

[3] * Magnier stood for LR at the previous election and swings are calculated based on parties and alliances.