Isabelle Huppert is a goddess. How many French actresses have won the Oscar? On top of my head, I only can think of Juliette Binoche and Marion Cotillard. Emmanuelle Riva would have been my first pick when she was up for Amour (also my personal best film of that year), but alas. I know Catherine Deneuve and Isabelle Adjani have been nominated as well. Of the ones I listed, I know Binoche, Cotillard, and Adjani have been nominated for the Oscar more than once.
The goddess of goddesses, Simone Signoret, won for Room at the Top.