This paper compares the theories of Hervaeus Natalis and Franz Brentano on intentionality. It considers three questions: the status of the intentional object, the question of the definition of the intentional relation, and the identification of the mark of the mental. Throughout the study, the analysis of Aristotle’s works serves as a tertium comparationis between the two authors. Although the comparison reveals some similar approaches to the matter, it shows distinct strategies regarding the distinction between what is mental and what (...) is not. (shrink)