Sidse Babett Knudsen is a Danish actress who works in theatre, television, and film. Knudsen made her screen debut in the 1997 improvisational comedy Let's Get Lost, for which she received both the Robert and Bodil awards for Best Actress.

The César Award for Best Actress in a Supporting Role is one of the César Awards, presented annually by the Académie des Arts et Techniques du Cinéma to recognize the outstanding performance in a supporting role of an actress who has worked within the French film industry during the year preceding the ceremony. Nominees and winner are selected via a run-off voting by all the members of the Académie.