My partner is of foreign nationality. We plan to get married. Will our union allow him/her to immediately acquire French nationality?

No. Marriage does not automatically have any effect on the nationality (art. 21-1 C. civ.). When a foreign person marries a French person and wishes to obtain the French nationality, they must apply for it by filing a declaration of French nationality via marriage with the dedicated access platform of the applicant's place of residence. This request cannot be made before the expiry of a period of four years after the marriage and is provided on the date of the community life declaration, which concerns both emotional and material, that has not ceased between the spouses since the marriage and that the French spouse has retained his nationality (art. 21-2 C. civ.).