Design is expressed as an activity involving the projection of elements related to reproduction. Productive types of this activity are consolidated, especially, by the manipulation of images. The concrete and decipherable perception of these images presupposes the use of semiotics to enable meaning and create pronouncements. To hold a public or an audience, these pronouncements are interwoven within a system of rhetoric based on the inclusion of Aristotelian Rhetoric and based on an ethos, a pathos and a logos, as forms of persuasive arguments. It is then manifested as a stimulating or at least seductive relationship between Rhetoric and Image. When comparing the idea of this relationship with the attributes engendered by the products of Design, an expression of a Design Rhetoric can be seen. Based on Chaïm Perelman’s Treatise on argumentation in which Rhetoric is the foundation of its renovation, this Theory creates a reflective approach regarding the contribution of Rhetoric toward a Theory of Design. Since the purpose of Design encompasses a vast exploratory field, a specific type has been selected for the study - Graphic Design. It presupposes the existence of Rhetoric inherent to the nature of Graphic Design. As a sample case, covers of the Brazilian leading news magazines have been taken. As a result, a set of delimiting theoretical presuppositions were arrived at for a Graphic Design Rhetoric and for the recognition of the relevance of the imbrications of Graphic Design and Rhetoric in the construction and delineation of a Design Theory. Finally, the possibility of providing evidence of ideological proposals in graphic projects based on rhetorical analysis was also included.