The 5th constituency of Charente-Maritime (French: Cinquième circonscription de la Charente-Maritime) is one of five electoral districts in the department of Charente-Maritime, 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 nine (pre-2015) cantons: those of Le Château-d'Oléron, Marennes, Royan-Ouest, Saint-Agnant, Saint-Pierre-d'Oléron, Saint-Porchaire, Saujon, Tonnay-Charente, and La Tremblade.

At the time of the 1999 census (which was the basis for the most recent redrawing of constituency boundaries, carried out in 2010) the 5th constituency had a total population of 112,002.

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