The Grand Prix is named 'Grand prix du vingtième anniversaire du Festival international du film' for the festival's 20th anniversary.
A new non-competitive festival section called "Directors' Fortnight" is created.
Winners:
Signore & signori (1966) - Pietro Germi - In 1966 the Grand Prize was given as 'Grand prix du vingtième anniversaire du Festival international du film' (20th Anniversary Grand Prize).
Un homme et une femme (1966) - Claude Lelouch - In 1966 the Grand Prize was given as 'Grand prix du vingtième anniversaire du Festival international du film' (20th Anniversary Grand Prize).