Catherine Allégret (born 16 April 1946) is a French actress.

She is the daughter of Simone Signoret and Yves Allégret.

[1] In 2007, she portrayed Édith Piaf's neglectful grandmother Louise Gassion in Olivier Dahan's biopic La Vie En Rose (La Môme in French).

Her second husband is Maurice Vaudaux, with whom she has a daughter, Clémentine.

In 2004, Allégret published a memoir titled World Upside Down (Un monde à l'envers) in which she wrote that she was sexually abused by her stepfather Yves Montand for many years from the age of 5.