Geneviève Suzanne Marie-Thérèse Mulmann (born 30 August 1932), also known as Geneviève de Fontenay, is a former chairman of the boards of Miss France and Miss Europe. Fontenay and her son Xavier Poirot sold the "Miss France" name to the group Endemol.

In 2010, Fontenay created a rival beauty pageant contest, Miss Nationale, in partnership with the Swiss entrepreneur Eric Cormier.

The name of "Fontenay", which Mulmann uses in her work, is simply a made-up pseudonym, but it is also used by her son Xavier Poirot.

She was born in Longwy, Meurthe-et-Moselle, and lives in Saint-Cloud.