Ça ira - Il fiume della rivolta ("Ça ira - The River of Revolt"), also released internationally as Thermidor, is an Italian collage film combining documentary and drama genres, directed by Tinto Brass.

Taking its name from the popular revolutionary song "Ça ira", the film is a critical narrative of 20th century revolutions from 1900 to 1962 and their legacy.

[1] Brass strings together a series of stark and direct sequences depicting the October Revolution, the Mexican Revolution, the Great War, the Japanese invasion of China, the Spanish Civil War, World War II, Nazism, Fascism, the extermination camps, and the atomic bombings of Hiroshima and Nagasaki.

The film also includes Paul Éluard reading one of his poems, and features two songs performed by Édith Piaf and Edmonda Aldini.

Additionally, it introduces the theme of sex as an ideological disruptor.