Louis Mermaz (born 20 August 1931) is a French politician. He was born in Paris.
Mermaz was a member of the Socialist Party. Mermaz was a member of the National Assembly from 1997 to 2001. He was President of the National Assembly between 1981 to 1986.
He was Minister of Agriculture from 1990 to 1992, and Minister of Relations with Parliament in the Bérégovoy government from 1992 to 1993.