Le present ouvrage est un recueil d'articles de chercheurs internationaux sur l'apport a l'ontologie du phenomenologue polonais Roman Ingarden. Il contient des contributions sur des themes aussi divers que la dependance existentielle, les categories ontologiques, les modes d'etre, la substance, la causalite, la forme, l'idealisme ou encore l'ontologie des objets fictifs. Ce volume demontre que la pensee d'Ingarden ne se limite pas a la phenomenologie et a l'histoire de celle-ci, mais est susceptible d'apporter une contribution singuliere a la recherche metaphysique contemporaine. This books is a collection of papers written by international researchers on the contribution to ontology of the Polish phenomenologist Roman Ingarden. It contains texts of such various themes as ontological dependency, ontological categories, modes of being, substance, causality, form, idealism and the ontology fictional objects. This book shows that Ingarden’s thought goes beyond phenomenology and its history, and could be of a valuable interest for contemporary metaphysical research.