Marina Sylvie Foïs (born 21 January 1970) is a French actress.

She was born in Boulogne-Billancourt, Hauts-de-Seine, into a family with Russian, Jewish-Egyptian, German and Italian roots. Marina Foïs was spotted in 1986 thanks to her comedy work in "L'École des femmes" at the age of 16. She decided to take correspondence courses and two years later passed her high school leaving exam. She then joined the troupe The Royal Imperial Green Rabbit Company, which later became Les Robins des Bois and consisted of students from the Cours Florent who trained under Isabelle Nanty.

In 1996 the troupe caught the attention of Dominique Farrugia and for two years performed and staged sketches in the show La Grosse Émission on Comédie+. During this period Foïs, together with Pierre-François Martin-Laval, wrote sketches, playing many different characters such as the dim-witted Sophie Pethoncule and the pedantic director Marie-Mur. The following year the show continued on Canal+ and reached a wider audience. In June 2001 Foïs and the troupe parted ways to focus on individual film careers. Marina Foïs became a prolific actress, releasing between two and five films a year.

On 25 November 2020 it was announced that she would host the 46th César Awards ceremony.