
Guy Decomble (1910–1964) was a French film and television actor. A character actor he played in a number of supporting parts in postwar cinema. One of his better known roles is as the teacher in The 400 Blows by François Truffaut.

The 400 Blows
1959 · as Professeur de français

Thérèse Étienne
1958 · as Rothlisberger

Black Dossier
1955 · as Ll'inspecteur Leroy

The Magnificent Tramp
1959 · as Le chef de station de la R.A.T.P.

Bob le Flambeur
1956 · as Police Commissary Ledru

The Unfrocked One
1954 · as Le père Mascle

Forfaiture
1937 · as Un joueur

Maigret Sees Red
1963 · as l'inspecteur Lognon

We Are All Murderers
1952 · as Un inspecteur

Maigret Sets a Trap
1958 · as Mazet

François Villon
1945 · as Denisot

The Old Guard
1960 · as Coach driver

The Wreckers
1959

The Aristocrats
1955 · as Gustave, alcoolique, gardien de l'école communale

Bizarre, Bizarre
1937 · as le maquereau (uncredited)

The Cousins
1959 · as Le libraire

The Crime of Monsieur Lange
1936 · as Typesetter (uncredited)

Jour de Fête
1949 · as Roger