Sébastien Roch is a novel written by the French journalist, novelist and playwright Octave Mirbeau, and published by Charpentier in 1890.

That is the emotional story of "the murder of a child’s soul" by a Jesuit priest, a teacher at the private school for boys of Saint-François-Xavier in Vannes, Brittany, where Mirbeau spent four painful years as a pupil, before being expelled, at the age of fifteen, in suspicious circumstances.

Sébastien is expelled along with his only friend Bolorec, the boys having been accused of indulging in inappropriate sexual acts.

Aged twenty one, Sébastien is absurdly killed during the 1870 Franco-Prussian War, his body being carried from the battlefield by Bolorec.

Octave Mirbeau denounces the child sexual abuses and the impunity of the rapists, especially when they are priests: for the first time, he breaks a lasting taboo.