Louis Paul André Chack, (12 February 1876 – 9 January 1945), was a French Navy officer, author and Nazi collaborator.

He served in the Navy during the First World War and spent the interwar period writing books on naval history and agitating at the far right.

During the Second World War, he eagerly collaborated with the Nazis and presided a so-called "Comité d'action antibolchévique" ("Committee for Anti-Bolshevik Action").

He was vice-président of the l'Association nationale des officiers combattants (ANOC), under Right-Wing personalities such as Colonel Jean Ferrandi and Charles Trochu.

Chack was president of the Comité d’action antibolchévique (1941–1944), an anticommunist and antisemitic propaganda outlet used as a recruitment organ for the Légion des volontaires français contre le bolchévisme.

Chack inaugurated the exhibit Le Bolchevisme contre l'Europe, along with French and German fascists such as Paul Marion, Fernand de Brinon or Georges Claude.