As of 2019, 137 actresses have been nominated in the category, with a total of 34 different winners. The average age at first nomination is 41 and the average age of winners at first win is 38.
With three wins (1991, 1993, 1999), Dominique Blanc holds the record of most César Award for Best Supporting Actress. Eight actresses have won the César twice: Marie-France Pisier (1976, 1977), Nathalie Baye (1981, 1982), Suzanne Flon (1984, 1990), Annie Girardot (1996, 2002), Valérie Lemercier (1994, 2007), Julie Depardieu (2004, 2008), Anne Alvaro (2001, 2011) and Karin Viard (2003, 2019).
Marie-France Pisier and Nathalie Baye have won their two awards in consecutive years. Along with Adèle Haenel, they are the only three performers to have won two competitive acting César in a row. Including her Best Actress César won in 1983, Nathalie Baye is also the only performer to have won an acting César in three consecutive years, in 1981, 1982 and 1983.
Noémie Lvovsky and Karin Viard tie for the record of most nominations with 6, Lvovsky also holding the record of most nominations without ever winning the award. Stéphane Audran holds the record of most consecutive nominations with 3 (1982, 1983, 1984).
Nine women have won both the César Award for Best Supporting Actress and the César Award for Best Actress:
Nathalie Baye (Best Supporting Actress in 1981 and 1982, Best Actress in 1983 and 2006),
Annie Girardot (Best Actress in 1977, Best Supporting Actress in 1996 and 2002),
Dominique Blanc (Best Supporting Actress in 1991, 1993 and 1999, Best Actress in 2001),
Karin Viard (Best Actress in 2000, Best Supporting Actress in 2003 and 2019),
Marion Cotillard (Best Supporting Actress in 2005, Best Actress in 2008),
Emmanuelle Devos (Best Actress in 2002, Best Supporting Actress in 2010),
Adèle Haenel (Best Supporting Actress in 2014, Best Actress in 2015),
Catherine Frot (Best Supporting Actress in 1997, Best Actress in 2016).
Fanny Ardant (Best Actress in 1997, Best Supporting Actress in 2020),