"Anatomy of a Fall" by director Justine Triet won the big award at the 49th French César Film Awards in Paris, AFP reported.
The production has already won two Golden Globe Awards as well as a BAFTA.
The film won the award in the category of best film, and Triet became only the second woman in the history of French cinema to receive the award for best director.
24 years ago (2000) Tony Marshall won the award for his film Venus Beauty Institute.
"Anatomy of a Fall" walked away with a total of six statuettes.
Sandra Huller won best actress for her role in Anatomy of a Fall, and Arieh Worthalter won the César for best actor for his role in The Goldman Trial.
Adèle Exarchopoulos topped the Best Supporting Actress category for All Your Faces.
The Cesar for Best Supporting Actor went to Swann Arlo for his performance in Anatomy of a Fall.
Anatomy of a Fall also won Best Original Screenplay, created by Triet and her partner Arthur Harari, and Best Editing.
Anatomy of a Fall has five Oscar nominations, with the awards to be handed out on March 10 in Los Angeles.
The Animal Kingdom by director Thomas Cailley, which had the most nominations - 12, won five "Cesar" statuettes - the most important of which for visual effects, costumes, original music.
Director Christopher Nolan and actress Agnès Jaoui were honored with lifetime achievement awards in their respective careers. /BGNES