Pasteur

Sacha Guitry

Louis Pasteur

Maurice Schutz

Grandfather

José Squinquel

Émile Roux

Jean Périer

Doctor

André Marnay

Doctor

Pierre Labry

Doctor

Armand Lurville

The first witness

?

Camille Cousin

The second witness

Henry Bonvallet

Sadi Carnot, President of the Republic

Gaston Dubosc

President of the Academy of Medicine

François Rodon

Little Joseph Meister

Louis Maurel

Jules Guérin

?

Louis Gauthier

Poggiale

?

Pierre Athon

Student

Pierre Huchet

Servant (uncredited)