This dissertation could be described as a comparative study concerning Aristotle s ethics and Kant s moral philosophy, whose main aim is to indicate a relevant compatibility between these two philosophers views on the relation between the notions of happiness and moral/virtuous action. This task is carried out in four stages, to each of which corresponds one of the chapters of the work. The first of them deals directly with the interpretation of the role of happiness and virtuous action in Ethica Nicomachea. Aristotle s views on the theme are surveyed and interpreted, which yields a coherent picture of his ethical doctrine which seems capable of answering quite well to several demands that not only could not be dealt with according to other possible readings, but which also seem fundamental. The second one is dedicated to clarifying basic notions of Kant s moral philosophy. Some aspects of his deontological moral are scrutinized, as well as their proper role within Kant s philosophy as a whole. The explicit comparison of the two doctrines considered in the previous chapters starts taking place in the third one, where the motivations and the effective realisation of the moral/virtuous actions are discussed and analysed from the viewpoints of the interpretations of both thinkers theses already suggested. In the fourth chapter, the main conclusions of the dissertation are drawn from the results obtained throughout it – in short, they lead us to consider plausible to regard the Aristotelian notion of happiness as compatible in principle with the conceptual framework of Kant s moral.