Catherine Langeais, born Marie-Louise Terrasse, (9 August 1923 in Valence, Drôme – 23 April 1998 in Mantes-la-Jolie, Yvelines), was a French television presenter and actress.

On 28 January 1938, at the age of fourteen, when Marie-Louise was at a school dance, she was introduced by her brother to the politician and future president of the French Republic François Mitterrand.

A chronic illness, which she concealed for a long time, made the job difficult but did not prevent her from working until 1955.

In 1987, François Mitterrand presented her with the Legion of Honour award for her undeniable imprint on the history of French television.

Behind the official image she presented as "la fiancée des français", obsessed with appearance, she was a complex, courageous woman who throughout her life secretly fought illness.