Barbarin is the highest-profile Catholic cleric in France to become embroiled in a child abuse court case.
Preynat is expected go on trial for child abuse in Lyon later this year.
Ozon, best known for his colourful French farces and disorientating thrillers, said he wanted to tackle one of society’s darkest moments in order to ensure that clerical child abuse is “punished and never repeated”.
It is the most-high profile dramatisation of the alleged cover-up of clerical sexual abuse since the Oscar-winning Spotlight, set in Boston, was released in 2015.