Blandine Costaz is a French actress and voice-over artist.

Blandine Costaz studied at the Conservatory of Performing Arts in Paris and also received acting training at the Studio d’Entraînement à l’Art Dramatique in Paris. She gained recognition, among other things, as a narrator for documentary segments on the program *Die Sendung mit der Maus*, where she showcased her versatile voice. Furthermore, she works as a voice-over artist for museum audio guides, educational programs, and documentaries—including projects for MK Audio and Télévision Suisse Romande.